Viewing archive of Tuesday, 30 December 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 Dec 30 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 364 Issued at 2200Z on 30 Dec 2025IA. Analysis of Solar Active Regions and Activity from 29-2100Z to 30-2100Z Solar activity has been at low levels for the past 24 hours.
There are currently 9 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a chance for X-class flares on days one, two, and three (31 Dec, 01
Jan, 02 Jan).
IIA. Geophysical Activity Summary 29-2100Z to 30-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 563 km/s at 30/1514Z. Total IMF reached 9
nT at 30/1503Z. The maximum southward component of Bz reached -6 nT at
30/1515Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 5,612 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (31 Dec), unsettled to minor
storm levels on day two (01 Jan) and unsettled to active levels on day
three (02 Jan). Protons have a slight chance of crossing threshold on
days one, two, and three (31 Dec, 01 Jan, 02 Jan).
III. Event Probabilities 31 Dec to 02 Jan
| Class M | 60% | 60% | 60% |
| Class X | 25% | 25% | 25% |
| Proton | 15% | 15% | 15% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 30 Dec 182 Predicted 31 Dec-02 Jan 200/200/195 90 Day Mean 30 Dec 146
V. Geomagnetic A Indices
Observed Afr/Ap 29 Dec 009/009 Estimated Afr/Ap 30 Dec 008/009 Predicted Afr/Ap 31 Dec-02 Jan 011/012-021/029-013/018
VI. Geomagnetic Activity Probabilities 31 Dec to 02 Jan
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 45% | 35% |
| Minor storm | 10% | 25% | 15% |
| Major-severe storm | 01% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 15% |
| Minor storm | 30% | 25% | 30% |
| Major-severe storm | 40% | 70% | 45% |
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 | 2026/01/22 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| December 2025 | 124 +32.2 |
| January 2026 | 117.9 -6.1 |
| Last 30 days | 121.2 +12.1 |