Viewing archive of Friday, 12 December 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 Dec 12 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 346 Issued at 2200Z on 12 Dec 2025IA. Analysis of Solar Active Regions and Activity from 11-2100Z to 12-2100Z 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 likely to be moderate on
day one (13 Dec) and expected to be low with a chance for M-class flares
on days two and three (14 Dec, 15 Dec).
IIA. Geophysical Activity Summary 11-2100Z to 12-2100Z
The geomagnetic
field has been at unsettled to minor storm levels for the past 24 hours.
Solar wind speed reached a peak of 509 km/s at 12/0240Z. Total IMF
reached 14 nT at 12/2052Z. The maximum southward component of Bz reached
-14 nT at 12/2051Z. Electrons greater than 2 MeV at geosynchronous
orbit reached a peak level of 1078 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on day one (13 Dec), quiet to
active levels on day two (14 Dec) and quiet levels on day three (15
Dec).
III. Event Probabilities 13 Dec to 15 Dec
| Class M | 55% | 45% | 35% |
| Class X | 05% | 01% | 01% |
| Proton | 05% | 05% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 12 Dec 135 Predicted 13 Dec-15 Dec 130/120/120 90 Day Mean 12 Dec 151
V. Geomagnetic A Indices
Observed Afr/Ap 11 Dec 017/026 Estimated Afr/Ap 12 Dec 020/023 Predicted Afr/Ap 13 Dec-15 Dec 015/019-011/012-007/008
VI. Geomagnetic Activity Probabilities 13 Dec to 15 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 45% | 40% | 40% |
| Minor storm | 25% | 20% | 20% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 25% | 25% | 25% |
| Major-severe storm | 65% | 60% | 60% |
All times in UTC
Latest news
Sunday, 1 February 2026
Complex sunspot region 4366
Monday, 19 January 2026
CME impact! S4 solar radiation storm
Sunday, 18 January 2026
X1.9 solar flare with earth-directed CME
Latest forum messages
What, no CH/HSS thread? 18AR4377 2AR4374 16Yes, we really went to the moon before. 9Unspecified geomagnetic activity 68
More topicsSupport SpaceWeatherLive.com!
A lot of people come to SpaceWeatherLive to follow the Solar activity or if there is a chance to see the aurora, but with more traffic comes higher costs to keep the servers online. If you like SpaceWeatherLive and want to support the project you can choose a subscription for an ad-free site or consider a donation. With your help we can keep SpaceWeatherLive online!
Space weather facts
| Last X-flare | 2026/02/04 | X4.3 |
| Last M-flare | 2026/02/13 | M1.0 |
| Last geomagnetic storm | 2026/02/05 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| January 2026 | 112.6 -11.4 |
| February 2026 | 112.1 -0.5 |
| Last 30 days | 128.7 +30.6 |