Viewing archive of Sunday, 7 December 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 Dec 07 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 341 Issued at 2200Z on 07 Dec 2025IA. Analysis of Solar Active Regions and Activity from 06-2100Z to 07-2100Z 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 moderate
with a slight chance for an X-class flare on days one, two, and three
(08 Dec, 09 Dec, 10 Dec).
IIA. Geophysical Activity Summary 06-2100Z to 07-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed reached a peak of 732 km/s at 06/2106Z. Total IMF reached 9
nT at 07/1318Z. The maximum southward component of Bz reached -5 nT at
07/0216Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 1452 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on days one and three (08 Dec, 10
Dec) and minor storm to severe storm levels on day two (09 Dec). Protons
have a slight chance of crossing threshold on days one, two, and three
(08 Dec, 09 Dec, 10 Dec).
III. Event Probabilities 08 Dec to 10 Dec
| Class M | 65% | 65% | 65% |
| Class X | 15% | 15% | 15% |
| Proton | 15% | 15% | 15% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 07 Dec 194 Predicted 08 Dec-10 Dec 190/190/185 90 Day Mean 07 Dec 148
V. Geomagnetic A Indices
Observed Afr/Ap 06 Dec 015/016 Estimated Afr/Ap 07 Dec 011/013 Predicted Afr/Ap 08 Dec-10 Dec 013/018-048/070-022/033
VI. Geomagnetic Activity Probabilities 08 Dec to 10 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 20% | 35% |
| Minor storm | 30% | 30% | 35% |
| Major-severe storm | 20% | 50% | 20% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 05% |
| Minor storm | 20% | 15% | 20% |
| Major-severe storm | 70% | 85% | 75% |
All times in UTC
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Space weather facts
| Last X-flare | 2026/04/24 | X2.5 |
| Last M-flare | 2026/06/03 | M9.3 |
| Last geomagnetic storm | 2026/05/16 | Kp6- (G2) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (2%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| April 2026 | 79.3 -6.6 |
| June 2026 | 139.5 +60.2 |
| Last 30 days | 97.8 +5.2 |
