Viewing archive of Friday, 8 September 2023
Solar activity report
Report of Solar-Geophysical Activity 2023 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 2023IA. 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 C4 event observed at
08/0442Z from Region 3425 (N23E43). There are currently 6 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a chance for M-class flares 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 unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 394 km/s at 07/2100Z. Total IMF reached 7
nT at 08/1719Z. The maximum southward component of Bz reached -5 nT at
08/1459Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 834 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (09 Sep), quiet to unsettled
levels on day two (10 Sep) and quiet levels on day three (11 Sep).
III. Event Probabilities 09 Sep to 11 Sep
| Class M | 35% | 35% | 35% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 08 Sep 161 Predicted 09 Sep-11 Sep 160/160/155 90 Day Mean 08 Sep 162
V. Geomagnetic A Indices
Observed Afr/Ap 07 Sep 011/006 Estimated Afr/Ap 08 Sep 006/006 Predicted Afr/Ap 09 Sep-11 Sep 010/012-007/008-007/008
VI. Geomagnetic Activity Probabilities 09 Sep to 11 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 20% | 20% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 25% | 20% |
| Major-severe storm | 40% | 25% | 20% |
All times in UTC
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