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Solar activity report
Report of Solar-Geophysical Activity 2025 Apr 03 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 93 Issued at 2200Z on 03 Apr 2025IA. Analysis of Solar Active Regions and Activity from 02-2100Z to 03-2100Z 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
(04 Apr, 05 Apr, 06 Apr).
IIA. Geophysical Activity Summary 02-2100Z to 03-2100Z
The geomagnetic
field has been at unsettled to minor storm levels for the past 24 hours.
Solar wind speed reached a peak of 789 km/s at 03/0557Z. Total IMF
reached 11 nT at 03/1937Z. The maximum southward component of Bz reached
-11 nT at 03/1937Z. Protons greater than 10 MeV at geosynchronous orbit
reached a peak level of 3 pfu at 02/2110Z. Electrons greater than 2 MeV
at geosynchronous orbit reached a peak level of 524 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on days one and two (04 Apr, 05
Apr) and quiet to unsettled levels on day three (06 Apr). Protons have a
slight chance of crossing threshold on days one, two, and three (04 Apr,
05 Apr, 06 Apr).
III. Event Probabilities 04 Apr to 06 Apr
| Class M | 70% | 70% | 70% |
| Class X | 15% | 15% | 15% |
| Proton | 15% | 15% | 15% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 03 Apr 178 Predicted 04 Apr-06 Apr 178/176/176 90 Day Mean 03 Apr 178
V. Geomagnetic A Indices
Observed Afr/Ap 02 Apr 016/022 Estimated Afr/Ap 03 Apr 018/025 Predicted Afr/Ap 04 Apr-06 Apr 013/018-017/020-008/010
VI. Geomagnetic Activity Probabilities 04 Apr to 06 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 40% | 20% |
| Minor storm | 25% | 25% | 05% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 15% |
| Minor storm | 25% | 25% | 25% |
| Major-severe storm | 60% | 60% | 30% |
All times in UTC
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Space weather facts
| Last X-flare | 2025/12/08 | X1.1 |
| Last M-flare | 2025/12/12 | M1.1 |
| Last geomagnetic storm | 2025/12/12 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| November 2025 | 91.8 -22.8 |
| December 2025 | 128 +36.2 |
| Last 30 days | 108.4 +15.8 |