Viewing archive of Saturday, 23 August 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 Aug 23 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 235 Issued at 2200Z on 23 Aug 2025IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z Solar activity has been at moderate levels for the past 24
hours. 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 on days one, two, and three (24 Aug, 25 Aug,
26 Aug).
IIA. Geophysical Activity Summary 22-2100Z to 23-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 543 km/s at 22/2356Z. Total IMF reached 5
nT at 23/0004Z. The maximum southward component of Bz reached -3 nT at
22/2316Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 967 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on day one (24 Aug) and quiet to active levels on
days two and three (25 Aug, 26 Aug). Protons greater than 10 Mev have a
slight chance of crossing threshold on day one (24 Aug).
III. Event Probabilities 24 Aug to 26 Aug
| Class M | 35% | 45% | 45% |
| Class X | 05% | 05% | 05% |
| Proton | 10% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 23 Aug 143 Predicted 24 Aug-26 Aug 145/145/145 90 Day Mean 23 Aug 136
V. Geomagnetic A Indices
Observed Afr/Ap 22 Aug 009/009 Estimated Afr/Ap 23 Aug 006/007 Predicted Afr/Ap 24 Aug-26 Aug 006/005-010/012-011/015
VI. Geomagnetic Activity Probabilities 24 Aug to 26 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 35% | 40% |
| Minor storm | 01% | 15% | 15% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 10% |
| Minor storm | 20% | 30% | 30% |
| Major-severe storm | 20% | 50% | 55% |
All times in UTC
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