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Solar activity report
Report of Solar-Geophysical Activity 2025 Apr 01 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 91 Issued at 2200Z on 01 Apr 2025IA. Analysis of Solar Active Regions and Activity from 31-2100Z to 01-2100Z 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 expected to be moderate
with a chance for X-class flares on days one, two, and three (02 Apr, 03
Apr, 04 Apr).
IIA. Geophysical Activity Summary 31-2100Z to 01-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 526 km/s at 31/2142Z. Total IMF reached 14 nT at
01/1933Z. The maximum southward component of Bz reached -7 nT at
01/1357Z. Protons greater than 10 MeV at geosynchronous orbit reached a
peak level of 146 pfu at 01/0425Z. Electrons greater than 2 MeV at
geosynchronous orbit reached a peak level of 3630 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (02 Apr), quiet levels on day
two (03 Apr) and quiet to minor storm levels on day three (04 Apr).
Protons are likely to cross threshold on day one (02 Apr) and have a
chance of crossing threshold on days two and three (03 Apr, 04 Apr).
III. Event Probabilities 02 Apr to 04 Apr
| Class M | 75% | 75% | 75% |
| Class X | 25% | 25% | 25% |
| Proton | 60% | 25% | 25% |
| PCAF | yellow | ||
IV. Penticton 10.7 cm Flux
Observed 01 Apr 182 Predicted 02 Apr-04 Apr 180/176/176 90 Day Mean 01 Apr 179
V. Geomagnetic A Indices
Observed Afr/Ap 31 Mar 008/009 Estimated Afr/Ap 01 Apr 005/006 Predicted Afr/Ap 02 Apr-04 Apr 011/012-006/005-013/018
VI. Geomagnetic Activity Probabilities 02 Apr to 04 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 05% | 40% |
| Minor storm | 10% | 01% | 25% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 25% | 15% | 25% |
| Major-severe storm | 35% | 10% | 60% |
All times in UTC
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Space weather facts
| Last X-flare | 2025/03/28 | X1.1 |
| Last M-flare | 2025/04/01 | M2.5 |
| Last geomagnetic storm | 2025/03/27 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| February 2025 | 154.6 +17.6 |
| April 2025 | 152.5 -2.1 |
| Last 30 days | 130.7 -17.9 |