Space Weather Forecast Discussion
Forecast Discussion
Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
Issued: 2018 Aug 21 0030 UTC

Solar Activity
.24 hr Summary...
Solar activity was very low. Region 2719 (S07E29, Bxo/beta) was the only spotted region on the visible disk and was inactive. There were no Earth-directed CMEs visible in available coronagraph imagery.
.Forecast...
Solar activity is expected to be very low for the next three days (21-23 Aug).

Energetic Particle
.24 hr Summary...
The greater than 2 MeV electron flux reached high levels this period with a peak flux of 4,150 pfu observed at 20/2320 UTC. The greater than 10 MeV proton flux was steady at background levels.
.Forecast...
The greater than 2 MeV electron flux is expected to reach high levels for the next three days (21-23 Aug) due to enhanced

Solar Wind
.24 hr Summary...
Solar wind parameters reflected a negative polarity CH HSS. Solar wind speeds were around 500 km/s with the arrival of a CIR early in the day, and leveled off around 650 km/s by the end of the day. Total field strength values reached 13 nT with the CIR, then steadily decreased back to nominal levels by days end. The Bz component was mostly northward when the highest levels of total field strength were observed, but did briefly deflect southward to around -8 nT shortly after CIR onset. The phi angle was mostly negative post-CIR.
.Forecast...
Solar wind parameters are expected to remain enhanced for the next three days (21-23 Aug) due to the continued influence of a negative polarity CH HSS.

Geospace
.24 hr Summary...
The geomagnetic field was at mostly active to unsettled levels due to the influence of a negative polarity CH HSS.
.Forecast...
Mostly unsettled to active levels are expected over the next three days (21-23 Aug) due to the continued influence of a negative polarity CH HSS. There is the chance for G1 (Minor) levels to be observed the next two days (21-22 Aug) while solar wind speeds remain elevated.
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