Viewing archive of Friday, 31 October 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 Oct 31 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 304 Issued at 2200Z on 31 Oct 2025IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 31-2100Z Solar activity has been at low levels for the past 24 hours.
There are currently 3 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be low with a
slight chance for an M-class flare on days two and three (02 Nov, 03
Nov).
IIA. Geophysical Activity Summary 30-2100Z to 31-2100Z
The geomagnetic
field has been at unsettled to minor storm levels for the past 24 hours.
Solar wind speed reached a peak near 750 km/s around 31/0200Z. Total IMF
reached 11 nT at 30/2101Z. The maximum southward component of Bz reached
-9 nT at 31/0129Z. Electrons greater than 2 MeV at geosynchronous orbit
reached a peak level of 4,767 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to reach active levels through 03 Nov.
III. Event Probabilities 01 Nov to 03 Nov
| Class M | 05% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 31 Oct 125 Predicted 01 Nov-03 Nov 125/130/132 90 Day Mean 31 Oct 151
V. Geomagnetic A Indices
Observed Afr/Ap 30 Oct 024/038 Estimated Afr/Ap 31 Oct 019/026 Predicted Afr/Ap 01 Nov-03 Nov 015/018-014/015-010/012
VI. Geomagnetic Activity Probabilities 01 Nov to 03 Nov
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 25% |
| Minor storm | 20% | 20% | 10% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 15% |
| Minor storm | 30% | 30% | 30% |
| Major-severe storm | 50% | 50% | 40% |
All times in UTC
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Space weather facts
| Last X-flare | 2026/01/18 | X1.9 |
| Last M-flare | 2026/01/21 | M3.4 |
| Last geomagnetic storm | 2026/01/22 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| December 2025 | 124 +32.2 |
| January 2026 | 114.4 -9.6 |
| Last 30 days | 118.6 +9.5 |