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Solar activity report
Report of Solar-Geophysical Activity 2025 Apr 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 110 Issued at 2200Z on 20 Apr 2025IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z 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 low with
a chance for M-class flares on days one, two, and three (21 Apr, 22 Apr,
23 Apr).
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic
field has been at quiet to minor storm levels for the past 24 hours.
Solar wind speed reached a peak of 455 km/s at 20/0206Z. Total IMF
reached 13 nT at 20/1930Z. The maximum southward component of Bz reached
-9 nT at 20/1901Z. Electrons greater than 2 MeV at geosynchronous orbit
reached a peak level of 801 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (21 Apr), quiet to major
storm levels on day two (22 Apr) and unsettled to major storm levels on
day three (23 Apr).
III. Event Probabilities 21 Apr to 23 Apr
| Class M | 40% | 40% | 40% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 20 Apr 156 Predicted 21 Apr-23 Apr 160/165/165 90 Day Mean 20 Apr 174
V. Geomagnetic A Indices
Observed Afr/Ap 19 Apr 018/018 Estimated Afr/Ap 20 Apr 014/014 Predicted Afr/Ap 21 Apr-23 Apr 010/012-023/035-024/035
VI. Geomagnetic Activity Probabilities 21 Apr to 23 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 35% | 35% |
| Minor storm | 05% | 40% | 40% |
| Major-severe storm | 01% | 20% | 15% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 05% | 05% |
| Minor storm | 20% | 15% | 20% |
| Major-severe storm | 20% | 80% | 75% |
All times in UTC
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Space weather facts
| Last X-flare | 2025/03/28 | X1.1 |
| Last M-flare | 2025/04/20 | M1.0 |
| Last geomagnetic storm | 2025/04/16 | Kp8- (G4) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2025 | 134.2 -20.4 |
| April 2025 | 119.8 -14.4 |
| Last 30 days | 113.4 -30.8 |