Viewing archive of Wednesday, 8 September 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 Sep 08 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 251 Issued at 2200Z on 08 Sep 2021IA. Analysis of Solar Active Regions and Activity from 07-2100Z to 08-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C8 event observed at
08/1730Z from Region 2866 (S18E07). There are currently 5 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a slight chance for an M-class flare on days one, two, and three (09
Sep, 10 Sep, 11 Sep).
IIA. Geophysical Activity Summary 07-2100Z to 08-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed reached a peak of 440 km/s at 08/1028Z. Total IMF reached 12
nT at 08/0850Z. The maximum southward component of Bz reached -9 nT at
08/0930Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 277 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (09 Sep) and quiet levels
on days two and three (10 Sep, 11 Sep).
III. Event Probabilities 09 Sep to 11 Sep
| Class M | 20% | 20% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 08 Sep 100 Predicted 09 Sep-11 Sep 100/100/100 90 Day Mean 08 Sep 081
V. Geomagnetic A Indices
Observed Afr/Ap 07 Sep 010/009 Estimated Afr/Ap 08 Sep 014/016 Predicted Afr/Ap 09 Sep-11 Sep 007/008-006/005-005/005
VI. Geomagnetic Activity Probabilities 09 Sep to 11 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 10% | 10% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 20% | 20% |
| Major-severe storm | 25% | 20% | 20% |
All times in UTC
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