Viewing archive of Saturday, 6 December 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 Dec 06 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 340 Issued at 2200Z on 06 Dec 2025IA. Analysis of Solar Active Regions and Activity from 05-2100Z to 06-2100Z Solar activity has been at high 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
(07 Dec, 08 Dec, 09 Dec).
IIA. Geophysical Activity Summary 05-2100Z to 06-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed reached a peak of 731 km/s at 06/1007Z. Total IMF reached 7
nT at 05/2109Z. The maximum southward component of Bz reached -6 nT at
06/1035Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 2135 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on days one and two (07 Dec, 08
Dec) and quiet levels on day three (09 Dec). Protons have a slight
chance of crossing threshold on days one, two, and three (07 Dec, 08
Dec, 09 Dec).
III. Event Probabilities 07 Dec to 09 Dec
| Class M | 65% | 65% | 65% |
| Class X | 15% | 15% | 15% |
| Proton | 10% | 10% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 06 Dec 200 Predicted 07 Dec-09 Dec 195/190/190 90 Day Mean 06 Dec 147
V. Geomagnetic A Indices
Observed Afr/Ap 05 Dec 010/013 Estimated Afr/Ap 06 Dec 016/021 Predicted Afr/Ap 07 Dec-09 Dec 012/018-014/018-005/005
VI. Geomagnetic Activity Probabilities 07 Dec to 09 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 40% | 10% |
| Minor storm | 25% | 25% | 01% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 15% |
| Minor storm | 20% | 20% | 20% |
| Major-severe storm | 65% | 65% | 15% |
All times in UTC
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Space weather facts
| Last X-flare | 2026/04/24 | X2.5 |
| Last M-flare | 2026/05/22 | M2.3 |
| 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 |
| May 2026 | 87.5 +8.2 |
| Last 30 days | 98 +7.5 |
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