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Solar activity report
Report of Solar-Geophysical Activity 2023 Apr 12 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 102 Issued at 2200Z on 12 Apr 2023IA. Analysis of Solar Active Regions and Activity from 11-2100Z to 12-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C6 event observed at
12/1153Z from Region 3276 (S21E52). There are currently 7 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a chance for M-class flares and a slight chance for an X-class flare on
days one, two, and three (13 Apr, 14 Apr, 15 Apr).
IIA. Geophysical Activity Summary 11-2100Z to 12-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 468 km/s at 12/1423Z. Total IMF reached 9 nT at
12/1406Z. The maximum southward component of Bz reached -4 nT at
12/1631Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 146 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (13 Apr), quiet levels on
day two (14 Apr) and quiet to active levels on day three (15 Apr).
III. Event Probabilities 13 Apr to 15 Apr
| Class M | 45% | 45% | 45% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 12 Apr 154 Predicted 13 Apr-15 Apr 155/160/165 90 Day Mean 12 Apr 166
V. Geomagnetic A Indices
Observed Afr/Ap 11 Apr 006/005 Estimated Afr/Ap 12 Apr 005/006 Predicted Afr/Ap 13 Apr-15 Apr 008/005-006/005-011/005
VI. Geomagnetic Activity Probabilities 13 Apr to 15 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 35% |
| Minor storm | 05% | 05% | 15% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 25% | 20% | 30% |
| Major-severe storm | 20% | 15% | 55% |
All times in UTC
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