Viewing archive of Friday, 11 April 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 Apr 11 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 101 Issued at 2200Z on 11 Apr 2025IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z Solar activity has been at moderate levels for the past 24
hours. There are currently 8 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 (12 Apr, 13 Apr,
14 Apr).
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed reached a peak of 527 km/s at 11/1226Z. Total IMF reached 8
nT at 11/2050Z. The maximum southward component of Bz reached -7 nT at
10/2105Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 3362 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on day one (12 Apr), unsettled to
active levels on day two (13 Apr) and quiet to unsettled levels on day
three (14 Apr).
III. Event Probabilities 12 Apr to 14 Apr
| Class M | 50% | 50% | 50% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 11 Apr 170 Predicted 12 Apr-14 Apr 160/160/150 90 Day Mean 11 Apr 178
V. Geomagnetic A Indices
Observed Afr/Ap 10 Apr 011/017 Estimated Afr/Ap 11 Apr 013/016 Predicted Afr/Ap 12 Apr-14 Apr 015/022-013/016-011/012
VI. Geomagnetic Activity Probabilities 12 Apr to 14 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 35% | 30% |
| Minor storm | 25% | 15% | 10% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 15% |
| Minor storm | 25% | 30% | 30% |
| Major-severe storm | 60% | 50% | 40% |
All times in UTC
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Space weather facts
| Last X-flare | 2025/03/28 | X1.1 |
| Last M-flare | 2025/04/14 | M4.2 |
| Last geomagnetic storm | 2025/04/06 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2025 | 134.2 -20.4 |
| April 2025 | 128.8 -5.4 |
| Last 30 days | 129.1 -15.1 |