Viewing archive of Monday, 27 October 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 Oct 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 300 Issued at 2200Z on 27 Oct 2025IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z Solar activity has been at low levels for the past 24 hours.
There are currently 7 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be low on days
one, two, and three (28 Oct, 29 Oct, 30 Oct).
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 407 km/s at 27/2057Z. Total IMF reached 10 nT at
27/2045Z. The maximum southward component of Bz reached -6 nT at
27/1602Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 899 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at active to minor storm levels on day one (28 Oct) and unsettled
to minor storm levels on days two and three (29 Oct, 30 Oct).
III. Event Probabilities 28 Oct to 30 Oct
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 27 Oct 121 Predicted 28 Oct-30 Oct 120/120/125 90 Day Mean 27 Oct 152
V. Geomagnetic A Indices
Observed Afr/Ap 26 Oct 004/004 Estimated Afr/Ap 27 Oct 010/012 Predicted Afr/Ap 28 Oct-30 Oct 024/035-021/030-020/025
VI. Geomagnetic Activity Probabilities 28 Oct to 30 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 40% | 40% |
| Minor storm | 35% | 30% | 20% |
| Major-severe storm | 15% | 15% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 10% |
| Minor storm | 20% | 25% | 25% |
| Major-severe storm | 75% | 70% | 60% |
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 | 2026/01/21 | Kp7+ (G3) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| December 2025 | 124 +32.2 |
| January 2026 | 110 -14 |
| Last 30 days | 114.8 +6.7 |