Viewing archive of Thursday, 19 August 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 Aug 19 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 231 Issued at 2200Z on 19 Aug 2021IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z Solar activity has been at very low levels for the past 24
hours. There are currently 2 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
with a slight chance for a C-class flare on days one, two, and three (20
Aug, 21 Aug, 22 Aug).
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 432 km/s at 19/0050Z. Total IMF reached 6 nT at
19/1512Z. The maximum southward component of Bz reached -6 nT at
19/1447Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 448 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on day one (20 Aug) and quiet to unsettled levels
on days two and three (21 Aug, 22 Aug).
III. Event Probabilities 20 Aug to 22 Aug
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 19 Aug 075 Predicted 20 Aug-22 Aug 075/073/073 90 Day Mean 19 Aug 079
V. Geomagnetic A Indices
Observed Afr/Ap 18 Aug 006/006 Estimated Afr/Ap 19 Aug 005/005 Predicted Afr/Ap 20 Aug-22 Aug 005/005-008/008-008/008
VI. Geomagnetic Activity Probabilities 20 Aug to 22 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 20% | 20% |
| Minor storm | 01% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 30% | 30% |
| Major-severe storm | 15% | 25% | 25% |
All times in UTC
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