Viewing archive of Monday, 8 September 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 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 2025IA. 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.
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 active levels for the past 24 hours. Solar
wind speed reached a peak of 639 km/s at 08/0833Z. Total IMF reached 8
nT at 07/2336Z. The maximum southward component of Bz reached -5 nT at
08/0855Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 492 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on days one and two (09 Sep, 10 Sep)
and quiet levels on day three (11 Sep).
III. Event Probabilities 09 Sep to 11 Sep
| Class M | 25% | 25% | 25% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 08 Sep 124 Predicted 09 Sep-11 Sep 135/130/125 90 Day Mean 08 Sep 146
V. Geomagnetic A Indices
Observed Afr/Ap 07 Sep 004/ NA Estimated Afr/Ap 08 Sep 012/014 Predicted Afr/Ap 09 Sep-11 Sep 007/008-007/008-006/005
VI. Geomagnetic Activity Probabilities 09 Sep to 11 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 10% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 30% | 30% | 20% |
| Major-severe storm | 25% | 25% | 20% |
All times in UTC
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Space weather facts
| Last X-flare | 2025/11/11 | X5.1 |
| Last M-flare | 2025/11/11 | M1.4 |
| Last geomagnetic storm | 2025/11/12 | Kp9- (G4) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
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| November 2025 | 100 -14.6 |
| Last 30 days | 98.3 -35.2 |