Viewing archive of Sunday, 28 December 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 Dec 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 362 Issued at 2200Z on 28 Dec 2025IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z Solar activity has been at low levels for the past 24 hours.
There are currently 10 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a chance for M-class flares and a slight chance for an X-class flare on
days one, two, and three (29 Dec, 30 Dec, 31 Dec).
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 604 km/s at 28/1526Z. Total IMF reached 7
nT at 28/0913Z. The maximum southward component of Bz reached -5 nT at
28/0901Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 8999 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on days one, two, and three (29 Dec, 30 Dec, 31
Dec). Protons have a slight chance of crossing threshold on days one,
two, and three (29 Dec, 30 Dec, 31 Dec).
III. Event Probabilities 29 Dec to 31 Dec
| Class M | 45% | 45% | 45% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 28 Dec 188 Predicted 29 Dec-31 Dec 185/175/170 90 Day Mean 28 Dec 146
V. Geomagnetic A Indices
Observed Afr/Ap 27 Dec 005/007 Estimated Afr/Ap 28 Dec 006/007 Predicted Afr/Ap 29 Dec-31 Dec 006/005-005/005-007/008
VI. Geomagnetic Activity Probabilities 29 Dec to 31 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 20% |
| Minor storm | 01% | 01% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 20% | 25% |
| Major-severe storm | 10% | 10% | 30% |
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 | 2026/01/20 | Kp8 (G4) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| December 2025 | 124 +32.2 |
| January 2026 | 107.3 -16.8 |
| Last 30 days | 113 +4.9 |