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Solar activity report
Report of Solar-Geophysical Activity 2025 Mar 31 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 90 Issued at 2200Z on 31 Mar 2025IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 31-2100Z Solar activity has been at moderate 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 (01 Apr, 02
Apr, 03 Apr).
IIA. Geophysical Activity Summary 30-2100Z to 31-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 534 km/s at 31/1444Z. Total IMF reached 11
nT at 31/1109Z. The maximum southward component of Bz reached -7 nT at
31/1515Z. Protons greater than 10 MeV at geosynchronous orbit reached a
peak level of 37 pfu at 31/1725Z. Electrons greater than 2 MeV at
geosynchronous orbit reached a peak level of 2038 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on days one and two (01 Apr, 02 Apr)
and quiet levels on day three (03 Apr). Protons are expected to cross
threshold on day one (01 Apr), have a chance of crossing threshold on
day two (02 Apr) and have a chance of crossing threshold on day three
(03 Apr).
III. Event Probabilities 01 Apr to 03 Apr
| Class M | 75% | 75% | 75% |
| Class X | 25% | 25% | 25% |
| Proton | 80% | 35% | 25% |
| PCAF | yellow | ||
IV. Penticton 10.7 cm Flux
Observed 31 Mar 172 Predicted 01 Apr-03 Apr 175/175/170 90 Day Mean 31 Mar 179
V. Geomagnetic A Indices
Observed Afr/Ap 30 Mar 008/010 Estimated Afr/Ap 31 Mar 008/008 Predicted Afr/Ap 01 Apr-03 Apr 009/010-008/008-006/005
VI. Geomagnetic Activity Probabilities 01 Apr to 03 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 10% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 30% | 30% | 20% |
| Major-severe storm | 25% | 25% | 20% |
All times in UTC
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Space weather facts
| Last X-flare | 2026/06/03 | X1.0 |
| Last M-flare | 2026/06/21 | M6.9 |
| Last geomagnetic storm | 2026/06/11 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (2%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| May 2026 | 101.4 +22.1 |
| June 2026 | 97.5 -3.9 |
| Last 30 days | 107.2 +8.4 |
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