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| Advisories / Alerts |
| Severe Wx Summary! | |
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 Fire Weather Watch |
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| Tue, Aug 21, 2018 - 9:14pm |
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Info Links
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| Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 233 Issued at 2200Z on 21 Aug 2018 |
| IA. Analysis of Solar Active Regions and Activity from 20/2100Z to
21/2100Z: Solar activity has been at very low levels for the past 24 hours. There are currently 1 numbered sunspot regions on the disk. |
| IB. Solar Activity Forecast Solar activity is expected to be very low on days one, two, and three (22 Aug, 23 Aug, 24 Aug). |
| IIA. Geophysical Activity Summary 20/2100Z to 21/2100Z The geomagnetic field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 710 km/s at 20/2106Z. Total IMF reached 5 nT at 21/1904Z. The maximum southward component of Bz reached -3 nT at 20/2109Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 9296 pfu. |
| IIB. Geophysical Activity Forecast The geomagnetic field is expected to be at quiet to unsettled levels on days one, two, and three (22 Aug, 23 Aug, 24 Aug). |
Product: 3-Day Forecast - Issued: 2018 Aug 22 0030 UTC
Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center.
Geomagnetic Activity Observation and Forecast
The greatest observed 3 hr Kp over the past 24 hours was 3 (below NOAA Scale levels). The greatest expected 3 hr Kp for Aug 22-Aug 24 2018 is 3 (below NOAA Scale levels).
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Rationale: No G1 (Minor) or greater geomagnetic storms are expected. No significant transient or recurrent solar wind features are forecast.
Solar Radiation Activity Observation and Forecast
Solar radiation, as observed by NOAA GOES-15 over the past 24 hours, was below S-scale storm level thresholds.
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Rationale: No S1 (Minor) or greater solar radiation storms are expected. No significant active region activity favorable for radiation storm production is forecast.
Radio Blackout Activity and Forecast
No radio blackouts were observed over the past 24 hours.
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Rationale: No R1 (Minor) or greater radio blackouts are expected. No significant active region flare activity is forecast.
Product: 27 day Space Weather Outlook - Issued: 2018 Aug 20 0445 UTC
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| This plot shows 3-days of 5-minute solar x-ray flux values measured on the SWPC primary and secondary GOES satellites. | The Satellite Environment Plot combines satellite and ground-based data to provide an overview of the current geosynchronous satellite environment. |
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| Large Angle and Spectrometric Coronagraph (LASCO). | Real-Time Solar Wind data broadcast from NASA's ACE satellite. |
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Instruments on board the NOAA Polar-orbiting Operational Environmental Satellite (POES) continually monitor the power flux carried by the protons and electrons that produce aurora in the atmosphere. SWPC has developed a technique that uses the power flux observations obtained during a single pass of the satellite over a polar region (which takes about 25 minutes) to estimate the total power deposited in an entire polar region by these auroral particles. The power input estimate is converted to an auroral activity index that ranges from 1 to 10. |
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The sun is constantly monitored for sun spots and coronal mass ejections. EIT (Extreme ultraviolet Imaging Telescope) images the solar atmosphere at several wavelengths, and therefore, shows solar material at different temperatures. In the images taken at 304 Angstrom the bright material is at 60,000 to 80,000 degrees Kelvin. In those taken at 171 Angstrom, at 1 million degrees. 195 Angstrom images correspond to about 1.5 million Kelvin, 284 Angstrom to 2 million degrees. The hotter the temperature, the higher you look in the solar atmosphere. |
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| This plot shows the Solar Cycle Sun Spot Number Progression. | This plot shows the F10.7cm Radio Flux Progression. |
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| This plot shows the Solar Cycle Ap Progression. | Sunspot Cycle 22, 23, and 24 |
The Solar Cycle is observed by counting the frequency and placement of sunspots visible on the Sun.
Solar minimum occurred in December, 2008.
Solar maximum was expected to occur in May, 2013.
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| Notes: LD means "Lunar Distance." 1 LD = 384,401 km, the distance between Earth and the Moon. 1 LD also equals 0.00256 AU. MAG is the visual magnitude of the asteroid on the date of closest approach. |
| Source: Space Weather.com |
| Glowing Elements in the Soul Nebula | |||
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2018 August 21 |
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Explanation: Stars are forming in the Soul of the Queen of Aethopia. More specifically, a large star forming region called the Soul Nebula (IC 1898) can be found in the direction of the constellation Cassiopeia, who Greek mythology credits as the vain wife of a King who long ago ruled lands surrounding the upper Nile river. The Soul Nebula houses several open clusters of stars, a large radio source known as W5, and huge evacuated bubbles formed by the winds of young massive stars. Located about 6,500 light years away, the Soul Nebula spans about 100 light years and is usually imaged next to its celestial neighbor the Heart Nebula (IC 1805). The featured image is a composite of three exposures in different colors: red as emitted by hydrogen gas, yellow as emitted by sulfur, and blue as emitted by oxygen. |
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| High Resolution Image | |||
| Tomorrow’s Image: nearby asteroid | |||
| Credit & Copyright: Jesús M.Vargas & Maritxu Poyal | |||
| Courtesy of Astronomy Picture of the Day Index - Main Page & Astronomy Picture of the Day |
Space Weather Images and Information (excluded from copyright) courtesy of: NOAA / NWS Space Weather Prediction Center, Mauna Loa Solar Observatory (HAO/NCAR), and SOHO (ESA & NASA).
Past 7 Days of Astronomy Pic of the DayPowered by Space Weather PHP script by Mike Challis
additions by Martin of Hebrides Weather, Ken True of Saratoga Weather,
Jerry Wilkins of Southeast Lincoln Weather and Jeremy Dyde of Jerbils Weather
Ambient Weather VWS v14.00 Top Contact