Space Weather Alerts, Watches and Warnings
Issue Time: 2023 Jun 07 0944 UTC | ALERT: Type II Radio Emission Begin Time: 2023 Jun 07 0637 UTC Estimated Velocity: 543 km\/s
| Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event. | | |
Issue Time: 2023 Jun 04 2102 UTC | ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 Jun 04 2059 UTC Synoptic Period: 1800-2100 UTC Active Warning: Yes
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 Jun 04 1906 UTC | WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 Jun 04 1905 UTC Valid To: 2023 Jun 05 0900 UTC Warning Condition: Onset
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 Jun 02 1946 UTC | WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day: Jun 03: G1 (Minor) Jun 04: None (Below G1) Jun 05: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 Jun 01 0853 UTC | EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4392 Valid From: 2023 Jun 01 0116 UTC Now Valid Until: 2023 Jun 01 1500 UTC Warning Condition: Persistence
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 Jun 01 0247 UTC | ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 Jun 01 0245 UTC Synoptic Period: 0000-0300 UTC Active Warning: Yes
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 Jun 01 0115 UTC | WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 Jun 01 0116 UTC Valid To: 2023 Jun 01 0900 UTC Warning Condition: Onset
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 30 2047 UTC | WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day: May 31: None (Below G1) Jun 01: None (Below G1) Jun 02: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 30 1109 UTC | SUMMARY: 10cm Radio Burst Begin Time: 2023 May 30 1020 UTC Maximum Time: 2023 May 30 1020 UTC End Time: 2023 May 30 1020 UTC Duration: 1 minutes Peak Flux: 210 sfu Latest Penticton Noon Flux: 154 sfu
| Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications. | | |
Issue Time: 2023 May 28 0531 UTC | CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3337 Begin Time: 2023 May 22 1545 UTC Yesterday Maximum 2MeV Flux: 4253 pfu
| Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems. | | |
Issue Time: 2023 May 27 2027 UTC | ALERT: Type II Radio Emission Begin Time: 2023 May 27 1927 UTC Estimated Velocity: 470 km\/s
| Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event. | | |
Issue Time: 2023 May 27 0459 UTC | CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3336 Begin Time: 2023 May 22 1545 UTC Yesterday Maximum 2MeV Flux: 4078 pfu
| Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems. | | |
Issue Time: 2023 May 27 0455 UTC | ALERT: Type II Radio Emission Begin Time: 2023 May 27 0436 UTC Estimated Velocity: 544 km\/s
| Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event. | | |
Issue Time: 2023 May 26 0459 UTC | CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3335 Begin Time: 2023 May 22 1545 UTC Yesterday Maximum 2MeV Flux: 3826 pfu
| Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems. | | |
Issue Time: 2023 May 25 2057 UTC | EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4390 Valid From: 2023 May 25 0200 UTC Now Valid Until: 2023 May 26 0900 UTC Warning Condition: Persistence
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 25 1456 UTC | EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4389 Valid From: 2023 May 25 0200 UTC Now Valid Until: 2023 May 25 2100 UTC Warning Condition: Persistence
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 25 0832 UTC | EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4388 Valid From: 2023 May 25 0200 UTC Now Valid Until: 2023 May 25 1500 UTC Warning Condition: Onset
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 25 0716 UTC | CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3334 Begin Time: 2023 May 22 1545 UTC Yesterday Maximum 2MeV Flux: 2694 pfu
| Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems. | | |
Issue Time: 2023 May 25 0200 UTC | WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 May 25 0200 UTC Valid To: 2023 May 25 0900 UTC Warning Condition: Onset
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 24 0506 UTC | CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3333 Begin Time: 2023 May 22 1545 UTC Yesterday Maximum 2MeV Flux: 1402 pfu
| Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems. | | |
Issue Time: 2023 May 24 0255 UTC | EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4386 Valid From: 2023 May 23 2220 UTC Now Valid Until: 2023 May 24 1200 UTC Warning Condition: Persistence
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 23 2259 UTC | ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 May 23 2258 UTC Synoptic Period: 2100-2400 UTC Active Warning: Yes
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 23 2219 UTC | WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 May 23 2220 UTC Valid To: 2023 May 24 0300 UTC Warning Condition: Onset
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 23 1328 UTC | CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3332 Begin Time: 2023 May 22 1545 UTC Yesterday Maximum 2MeV Flux: 1267 pfu
| Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems. | | |
Issue Time: 2023 May 23 1309 UTC | ALERT: Type IV Radio Emission Begin Time: 2023 May 23 1120 UTC | Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms. | | |
Issue Time: 2023 May 22 2327 UTC | WARNING: Geomagnetic K-index of 5 expected Valid From: 2023 May 22 2325 UTC Valid To: 2023 May 23 0600 UTC Warning Condition: Onset NOAA Scale: G1 - Minor
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 22 2327 UTC | EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4384 Valid From: 2023 May 22 1937 UTC Now Valid Until: 2023 May 23 1500 UTC Warning Condition: persistence
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 22 2049 UTC | ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 May 22 2042 UTC Synoptic Period: 1800-2100 UTC Active Warning: Yes
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 22 1939 UTC | WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 May 22 1937 UTC Valid To: 2023 May 23 0300 UTC Warning Condition: Onset
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 22 1557 UTC | ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Threshold Reached: 2023 May 22 1545 UTC Station: GOES16
| Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems. | | |
Issue Time: 2023 May 22 1400 UTC | ALERT: Type II Radio Emission Begin Time: 2023 May 22 1340 UTC Estimated Velocity: 439 km\/s
| Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event. | | |
Issue Time: 2023 May 22 1153 UTC | WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day: May 23: G1 (Minor) May 24: G1 (Minor) May 25: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 22 0231 UTC | ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 May 22 0230 UTC Synoptic Period: 0000-0300 UTC Active Warning: Yes NOAA Scale: G1 - Minor
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 22 0001 UTC | ALERT: Geomagnetic K-index of 6 Threshold Reached: 2023 May 21 2358 UTC Synoptic Period: 2100-0000 UTC Active Warning: Yes NOAA Scale: G2 - Moderate
| Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms. Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible. Radio - HF (high frequency) radio propagation can fade at higher latitudes. Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state. | | |
Issue Time: 2023 May 21 2205 UTC | WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day: May 22: G2 (Moderate) May 23: G1 (Minor) May 24: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 21 2136 UTC | ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 May 21 2136 UTC Synoptic Period: 2100-2400 UTC Active Warning: Yes NOAA Scale: G1 - Minor
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 21 2105 UTC | ALERT: Geomagnetic K-index of 6 Threshold Reached: 2023 May 21 2059 UTC Synoptic Period: 1800-2100 UTC Active Warning: Yes NOAA Scale: G2 - Moderate
| Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms. Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible. Radio - HF (high frequency) radio propagation can fade at higher latitudes. Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state. | | |
Issue Time: 2023 May 21 2044 UTC | WARNING: Geomagnetic K-Index of 6 expected Valid From: 2023 May 21 2045 UTC Valid To: 2023 May 22 0300 UTC Warning Condition: Onset NOAA Scale: G2 - Moderate
| Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms. Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible. Radio - HF (high frequency) radio propagation can fade at higher latitudes. Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state. | | |
Issue Time: 2023 May 21 2038 UTC | ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 May 21 2037 UTC Synoptic Period: 1800-2100 UTC Active Warning: Yes NOAA Scale: G1 - Minor
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 21 2032 UTC | WARNING: Geomagnetic K-index of 5 expected Valid From: 2023 May 21 2033 UTC Valid To: 2023 May 22 0600 UTC Warning Condition: Onset NOAA Scale: G1 - Minor
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 21 2030 UTC | EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4382 Valid From: 2023 May 21 1600 UTC Now Valid Until: 2023 May 22 1200 UTC Warning Condition: Persistence
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 21 1610 UTC | ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 May 21 1610 UTC Synoptic Period: 1500-1800 UTC Active Warning: Yes
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 21 1559 UTC | WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 May 21 1600 UTC Valid To: 2023 May 21 2100 UTC Warning Condition: Onset
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 20 2338 UTC | SUMMARY: X-ray Event exceeded M5 Begin Time: 2023 May 20 2252 UTC Maximum Time: 2023 May 20 2306 UTC End Time: 2023 May 20 2321 UTC X-ray Class: M5.1 Optical Class: 2b Location: N16E48 NOAA Scale: R2 - Moderate
| Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth. Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes. | | |
Issue Time: 2023 May 20 2322 UTC | SUMMARY: 10cm Radio Burst Begin Time: 2023 May 20 2302 UTC Maximum Time: 2023 May 20 2303 UTC End Time: 2023 May 20 2304 UTC Duration: 2 minutes Peak Flux: 170 sfu Latest Penticton Noon Flux: 170 sfu
| Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications. | | |
Issue Time: 2023 May 20 2310 UTC | ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2023 May 20 2305 UTC NOAA Scale: R2 - Moderate
| Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http:\/\/www.swpc.noaa.gov\/products\/d-region-absorption-predictions-d-rap. | | |
Issue Time: 2023 May 20 2211 UTC | WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day: May 21: None (Below G1) May 22: None (Below G1) May 23: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 20 1755 UTC | EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4380 Valid From: 2023 May 19 2000 UTC Now Valid Until: 2023 May 21 0600 UTC Warning Condition: Persistence
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 20 1521 UTC | SUMMARY: X-ray Event exceeded M5 Begin Time: 2023 May 20 1454 UTC Maximum Time: 2023 May 20 1500 UTC End Time: 2023 May 20 1504 UTC X-ray Class: M5.6 Location: N18E53 NOAA Scale: R2 - Moderate
| Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth. Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes. | | |
Issue Time: 2023 May 20 1501 UTC | ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2023 May 20 1456 UTC NOAA Scale: R2 - Moderate
| Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http:\/\/www.swpc.noaa.gov\/products\/d-region-absorption-predictions-d-rap. | | |
Issue Time: 2023 May 20 1300 UTC | SUMMARY: X-ray Event exceeded M5 Begin Time: 2023 May 20 1225 UTC Maximum Time: 2023 May 20 1235 UTC End Time: 2023 May 20 1240 UTC X-ray Class: M8.9 Location: N18E54 NOAA Scale: R2 - Moderate
| Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth. Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes. | | |
Issue Time: 2023 May 20 1237 UTC | ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2023 May 20 1234 UTC NOAA Scale: R2 - Moderate
| Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http:\/\/www.swpc.noaa.gov\/products\/d-region-absorption-predictions-d-rap. | | |
Issue Time: 2023 May 20 0858 UTC | EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4379 Valid From: 2023 May 19 2000 UTC Now Valid Until: 2023 May 20 1800 UTC Warning Condition: Persistence
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 20 0855 UTC | EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1776 Valid From: 2023 May 20 0100 UTC Now Valid Until: 2023 May 20 1500 UTC Warning Condition: Persistence
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 20 0821 UTC | SUMMARY: X-ray Event exceeded M5 Begin Time: 2023 May 20 0716 UTC Maximum Time: 2023 May 20 0732 UTC End Time: 2023 May 20 0736 UTC X-ray Class: M6.4 Location: N18E56 NOAA Scale: R2 - Moderate
| Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth. Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes. | | |
Issue Time: 2023 May 20 0809 UTC | ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 May 20 0805 UTC Synoptic Period: 0600-0900 UTC Active Warning: Yes NOAA Scale: G1 - Minor
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 20 0745 UTC | SUMMARY: 10cm Radio Burst Begin Time: 2023 May 20 0731 UTC Maximum Time: 2023 May 20 0731 UTC End Time: 2023 May 20 0732 UTC Duration: 1 minutes Peak Flux: 170 sfu Latest Penticton Noon Flux: 165 sfu
| Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications. | | |
Issue Time: 2023 May 20 0734 UTC | ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2023 May 20 0730 UTC NOAA Scale: R2 - Moderate
| Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http:\/\/www.swpc.noaa.gov\/products\/d-region-absorption-predictions-d-rap. | | |
Issue Time: 2023 May 20 0554 UTC | ALERT: Geomagnetic K-index of 6 Threshold Reached: 2023 May 20 0553 UTC Synoptic Period: 0300-0600 UTC Active Warning: Yes NOAA Scale: G2 - Moderate
| Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms. Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible. Radio - HF (high frequency) radio propagation can fade at higher latitudes. Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state. | | |
Issue Time: 2023 May 20 0423 UTC | ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 May 20 0420 UTC Synoptic Period: 0300-0600 UTC Active Warning: Yes NOAA Scale: G1 - Minor
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 20 0301 UTC | ALERT: Geomagnetic K-index of 6 Threshold Reached: 2023 May 20 0259 UTC Synoptic Period: 0000-0300 UTC Active Warning: Yes NOAA Scale: G2 - Moderate
| Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms. Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible. Radio - HF (high frequency) radio propagation can fade at higher latitudes. Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state. | | |
Issue Time: 2023 May 20 0300 UTC | WARNING: Geomagnetic K-Index of 6 expected Valid From: 2023 May 20 0259 UTC Valid To: 2023 May 20 0900 UTC Warning Condition: Onset NOAA Scale: G2 - Moderate
| Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms. Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible. Radio - HF (high frequency) radio propagation can fade at higher latitudes. Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state. | | |
Issue Time: 2023 May 20 0150 UTC | ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 May 20 0150 UTC Synoptic Period: 0000-0300 UTC Active Warning: Yes NOAA Scale: G1 - Minor
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 20 0046 UTC | WARNING: Geomagnetic K-index of 5 expected Valid From: 2023 May 20 0100 UTC Valid To: 2023 May 20 0900 UTC Warning Condition: Onset NOAA Scale: G1 - Minor
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 19 2351 UTC | EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4378 Valid From: 2023 May 19 2000 UTC Now Valid Until: 2023 May 20 0900 UTC Warning Condition: Onset
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 19 2329 UTC | ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 May 19 2324 UTC Synoptic Period: 2100-2400 UTC Active Warning: Yes
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 19 1959 UTC | WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 May 19 2000 UTC Valid To: 2023 May 20 0000 UTC Warning Condition: Onset
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 19 0123 UTC | SUMMARY: X-ray Event exceeded M5 Begin Time: 2023 May 19 0041 UTC Maximum Time: 2023 May 19 0048 UTC End Time: 2023 May 19 0054 UTC X-ray Class: M5.3 Location: N18E76 NOAA Scale: R2 - Moderate
| Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth. Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes. | | |
Issue Time: 2023 May 19 0052 UTC | ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2023 May 19 0048 UTC NOAA Scale: R2 - Moderate
| Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http:\/\/www.swpc.noaa.gov\/products\/d-region-absorption-predictions-d-rap. | | |
Issue Time: 2023 May 17 1546 UTC | ALERT: Type II Radio Emission Begin Time: 2023 May 17 1522 UTC Estimated Velocity: 343 km\/s
| Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event. | | |
Issue Time: 2023 May 16 1755 UTC | ALERT: Type II Radio Emission Begin Time: 2023 May 16 1731 UTC Estimated Velocity: 886 km\/s
Comment: Associated with an M9.6 flare from just behind the SE limb
| Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event. | | |
Issue Time: 2023 May 16 1657 UTC | SUMMARY: X-ray Event exceeded M5 Begin Time: 2023 May 16 1631 UTC Maximum Time: 2023 May 16 1643 UTC End Time: 2023 May 16 1651 UTC X-ray Class: M9.6 Location: S23E95 NOAA Scale: R2 - Moderate
Comment: Flare location is just beyond the SE limb and estimated.
| Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth. Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes. | | |
Issue Time: 2023 May 16 1642 UTC | ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2023 May 16 1640 UTC NOAA Scale: R2 - Moderate
| Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http:\/\/www.swpc.noaa.gov\/products\/d-region-absorption-predictions-d-rap. | | |
Issue Time: 2023 May 13 2350 UTC | EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4376 Valid From: 2023 May 13 1920 UTC Now Valid Until: 2023 May 14 0600 UTC Warning Condition: Persistence
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 13 2055 UTC | ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 May 13 2055 UTC Synoptic Period: 1800-2100 UTC Active Warning: Yes
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 13 1920 UTC | WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 May 13 1920 UTC Valid To: 2023 May 13 2359 UTC Warning Condition: Onset
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 12 1451 UTC | EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4374 Valid From: 2023 May 12 0545 UTC Now Valid Until: 2023 May 13 0600 UTC Warning Condition: Persistence
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 12 1445 UTC | ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 May 12 1445 UTC Synoptic Period: 1200-1500 UTC Active Warning: Yes NOAA Scale: G1 - Minor
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 12 1442 UTC | WARNING: Geomagnetic K-index of 5 expected Valid From: 2023 May 12 1440 UTC Valid To: 2023 May 12 2359 UTC Warning Condition: Onset NOAA Scale: G1 - Minor
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 12 0640 UTC | SUMMARY: Geomagnetic Sudden Impulse Observed: 2023 May 12 0635 UTC Deviation: 34 nT Station: OTT
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 12 0549 UTC | WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 May 12 0545 UTC Valid To: 2023 May 12 1800 UTC Warning Condition: Onset
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 12 0220 UTC | SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu Begin Time: 2023 May 09 2335 UTC Maximum Time: 2023 May 10 1325 UTC End Time: 2023 May 11 0405 UTC Maximum 10MeV Flux: 80 pfu NOAA Scale: S1 - Minor
| Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications. | | |
Issue Time: 2023 May 11 2041 UTC | ALERT: Type IV Radio Emission Begin Time: 2023 May 11 1844 UTC | Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms. | | |
Issue Time: 2023 May 11 2022 UTC | ALERT: Type II Radio Emission Begin Time: 2023 May 11 1832 UTC Estimated Velocity: 356 km\/s
| Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event. | | |
Issue Time: 2023 May 11 1141 UTC | EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected Extension to Serial Number: 506 Valid From: 2023 May 09 2300 UTC Now Valid Until: 2023 May 11 2359 UTC Warning Condition: Persistence Predicted NOAA Scale: S1 - Minor
Comment: 10 MeV flux levels are still elevated but below the S1 threshold. Potential still exists for the S1 threshold to be exceeded
| Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies. | | |
Issue Time: 2023 May 11 0910 UTC | ALERT: Type II Radio Emission Begin Time: 2023 May 11 0857 UTC Estimated Velocity: 419 km\/s
| Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event. | | |
Issue Time: 2023 May 11 0144 UTC | ALERT: Type IV Radio Emission Begin Time: 2023 May 11 0105 UTC | Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms. | | |
Issue Time: 2023 May 11 0138 UTC | ALERT: Type II Radio Emission Begin Time: 2023 May 11 0106 UTC Estimated Velocity: 837 km\/s
| Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event. | | |
Issue Time: 2023 May 10 2352 UTC | EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected Extension to Serial Number: 505 Valid From: 2023 May 09 2300 UTC Now Valid Until: 2023 May 11 1200 UTC Warning Condition: Persistence Predicted NOAA Scale: S1 - Minor
| Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies. | | |
Issue Time: 2023 May 10 2052 UTC | EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4372 Valid From: 2023 May 09 2230 UTC Now Valid Until: 2023 May 11 1200 UTC Warning Condition: Persistence
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 10 1644 UTC | WATCH: Geomagnetic Storm Category G3 Predicted
Highest Storm Level Predicted by Day: May 10: G2 (Moderate) May 11: G3 (Strong) May 12: G2 (Moderate)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
| Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude. Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices. Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur. Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur. Radio - HF (high frequency) radio may be intermittent. Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon. | | |
Issue Time: 2023 May 10 1324 UTC | ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 May 10 1323 UTC Synoptic Period: 1200-1500 UTC Active Warning: Yes NOAA Scale: G1 - Minor
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 10 1106 UTC | EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected Extension to Serial Number: 504 Valid From: 2023 May 09 2300 UTC Now Valid Until: 2023 May 10 2359 UTC Warning Condition: Persistence Predicted NOAA Scale: S1 - Minor
| Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies. | | |
Issue Time: 2023 May 10 0847 UTC | EXTENDED WARNING: Geomagnetic K-Index of 6 expected Extension to Serial Number: 483 Valid From: 2023 May 10 0331 UTC Now Valid Until: 2023 May 10 1500 UTC Warning Condition: Onset
| Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms. Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible. Radio - HF (high frequency) radio propagation can fade at higher latitudes. Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state. | | |
Issue Time: 2023 May 10 0830 UTC | EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4371 Valid From: 2023 May 09 2230 UTC Now Valid Until: 2023 May 10 2100 UTC Warning Condition: Persistence
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 10 0829 UTC | EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1773 Valid From: 2023 May 09 2240 UTC Now Valid Until: 2023 May 10 1800 UTC Warning Condition: Persistence
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 10 0331 UTC | WARNING: Geomagnetic K-Index of 6 expected Valid From: 2023 May 10 0331 UTC Valid To: 2023 May 10 0900 UTC Warning Condition: Onset NOAA Scale: G2 - Moderate
| Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms. Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible. Radio - HF (high frequency) radio propagation can fade at higher latitudes. Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state. | | |
Issue Time: 2023 May 10 0325 UTC | ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 May 10 0317 UTC Synoptic Period: 0300-0600 UTC Active Warning: Yes NOAA Scale: G1 - Minor
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 10 0256 UTC | EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1772 Valid From: 2023 May 09 2240 UTC Now Valid Until: 2023 May 10 0900 UTC Warning Condition: Persistence
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 10 0256 UTC | EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4370 Valid From: 2023 May 09 2230 UTC Now Valid Until: 2023 May 10 1500 UTC Warning Condition: Persistence
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 10 0000 UTC | ALERT: Geomagnetic K-index of 5 Threshold Reached: 2023 May 09 2359 UTC Synoptic Period: 2100-0000 UTC Active Warning: Yes NOAA Scale: G1 - Minor
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 09 2322 UTC | ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu Begin Time: 2023 May 09 2322 UTC NOAA Scale: S1 - Minor
| Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies. | | |
Issue Time: 2023 May 09 2310 UTC | SUMMARY: Geomagnetic Sudden Impulse Observed: 2023 May 09 2248 UTC Deviation: 54 nT Station: frd
| Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies. | | |
Issue Time: 2023 May 09 2256 UTC | ALERT: Geomagnetic K-index of 4 Threshold Reached: 2023 May 09 2256 UTC Synoptic Period: 2100-2400 UTC Active Warning: Yes
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 09 2241 UTC | WARNING: Geomagnetic K-index of 5 expected Valid From: 2023 May 09 2240 UTC Valid To: 2023 May 10 0300 UTC Warning Condition: Onset NOAA Scale: G1 - Minor
| Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. | | |
Issue Time: 2023 May 09 2241 UTC | EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4369 Valid From: 2023 May 09 2230 UTC Now Valid Until: 2023 May 10 0900 UTC Warning Condition: Onset
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 09 2230 UTC | WARNING: Geomagnetic K-index of 4 expected Valid From: 2023 May 09 2230 UTC Valid To: 2023 May 10 0300 UTC Warning Condition: Onset
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
Issue Time: 2023 May 09 2227 UTC | WARNING: Geomagnetic Sudden Impulse expected Valid From: 2023 May 09 2230 UTC Valid To: 2023 May 09 2330 UTC IP Shock Passage Observed: 2023 May 09 2210 UTC | Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications. | | |
Issue Time: 2023 May 09 2055 UTC | ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2023 May 09 2051 UTC NOAA Scale: R2 - Moderate
| Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http:\/\/www.swpc.noaa.gov\/products\/d-region-absorption-predictions-d-rap. | | |
Issue Time: 2023 May 09 1954 UTC | WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day: May 10: G2 (Moderate) May 11: G1 (Minor) May 12: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
| Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms. Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible. Radio - HF (high frequency) radio propagation can fade at higher latitudes. Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state. | | |
Issue Time: 2023 May 09 1946 UTC | SUMMARY: 10cm Radio Burst Begin Time: 2023 May 09 1834 UTC Maximum Time: 2023 May 09 1852 UTC End Time: 2023 May 09 1921 UTC Duration: 47 minutes Peak Flux: 1300 sfu Latest Penticton Noon Flux: 172 sfu
| Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications. | | |
Issue Time: 2023 May 09 1932 UTC | ALERT: Type II Radio Emission Begin Time: 2023 May 09 1840 UTC Estimated Velocity: 1892 km\/s
Comment: Estimated velocity is likely too fast.
| Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event. | | |
Issue Time: 2023 May 09 1921 UTC | ALERT: Type IV Radio Emission Begin Time: 2023 May 09 1837 UTC | Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms. | | |
Issue Time: 2023 May 09 1616 UTC | SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu Begin Time: 2023 May 08 1240 UTC Maximum Time: 2023 May 09 0150 UTC End Time: 2023 May 09 1235 UTC Maximum 10MeV Flux: 38 pfu NOAA Scale: S1 - Minor
| Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies. | | |
Issue Time: 2023 May 09 0710 UTC | SUMMARY: 10cm Radio Burst Begin Time: 2023 May 09 0610 UTC Maximum Time: 2023 May 09 0611 UTC End Time: 2023 May 09 0625 UTC Duration: 14 minutes Peak Flux: 210 sfu Latest Penticton Noon Flux: 172 sfu
| Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications. | | |
Issue Time: 2023 May 09 0653 UTC | ALERT: Type IV Radio Emission Begin Time: 2023 May 09 0622 UTC | Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms. | | |
Issue Time: 2023 May 09 0435 UTC | ALERT: Type II Radio Emission Begin Time: 2023 May 09 0353 UTC Estimated Velocity: 641 km\/s
| Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event. | | |
Issue Time: 2023 May 09 0420 UTC | SUMMARY: 10cm Radio Burst Begin Time: 2023 May 09 0348 UTC Maximum Time: 2023 May 09 0351 UTC End Time: 2023 May 09 0354 UTC Duration: 6 minutes Peak Flux: 360 sfu Latest Penticton Noon Flux: 172 sfu
| Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications. | | |
Issue Time: 2023 May 09 0410 UTC | SUMMARY: X-ray Event exceeded M5 Begin Time: 2023 May 09 0342 UTC Maximum Time: 2023 May 09 0354 UTC End Time: 2023 May 09 0405 UTC X-ray Class: M6.5 Optical Class: 1n Location: N12W13 NOAA Scale: R2 - Moderate
| Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth. Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes. | | |
Issue Time: 2023 May 09 0356 UTC | ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2023 May 09 0353 UTC NOAA Scale: R2 - Moderate
| Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http:\/\/www.swpc.noaa.gov\/products\/d-region-absorption-predictions-d-rap. | | |
Issue Time: 2023 May 09 0249 UTC | EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 4367 Valid From: 2023 May 08 1406 UTC Now Valid Until: 2023 May 09 1500 UTC Warning Condition: Persistence
| Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. | | |
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