Viewing archive of Sunday, 19 October 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 Oct 19 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 292 Issued at 2200Z on 19 Oct 2025IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z Solar activity has been at moderate levels for the past 24
hours. There are currently 8 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 day one (20 Oct) and expected to be low
with a slight chance for an M-class flare on days two and three (21 Oct,
22 Oct).
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
The geomagnetic
field has been at quiet to minor storm levels for the past 24 hours.
Solar wind speed reached a peak of 621 km/s at 19/1936Z. Total IMF
reached 13 nT at 18/2324Z. The maximum southward component of Bz reached
-9 nT at 19/1654Z. Electrons greater than 2 MeV at geosynchronous orbit
reached a peak level of 443 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (20 Oct) and quiet to
unsettled levels on days two and three (21 Oct, 22 Oct).
III. Event Probabilities 20 Oct to 22 Oct
| Class M | 25% | 20% | 20% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 19 Oct 149 Predicted 20 Oct-22 Oct 150/152/150 90 Day Mean 19 Oct 154
V. Geomagnetic A Indices
Observed Afr/Ap 18 Oct 020/020 Estimated Afr/Ap 19 Oct 016/018 Predicted Afr/Ap 20 Oct-22 Oct 011/012-010/010-009/008
VI. Geomagnetic Activity Probabilities 20 Oct to 22 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 20% | 20% |
| Minor storm | 15% | 05% | 05% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 15% |
| Minor storm | 25% | 25% | 25% |
| Major-severe storm | 50% | 25% | 25% |
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 |