Viewing archive of Saturday, 19 April 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 Apr 19 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 109 Issued at 2200Z on 19 Apr 2025IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z 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 (20 Apr, 21 Apr,
22 Apr).
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed reached a peak of 520 km/s at 19/0612Z. Total IMF reached 9
nT at 19/2100Z. The maximum southward component of Bz reached -8 nT at
19/2058Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 456 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on days one and two (20 Apr, 21 Apr) and
quiet to major storm levels on day three (22 Apr).
III. Event Probabilities 20 Apr to 22 Apr
| Class M | 40% | 40% | 40% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 19 Apr 157 Predicted 20 Apr-22 Apr 160/165/165 90 Day Mean 19 Apr 175
V. Geomagnetic A Indices
Observed Afr/Ap 18 Apr 011/ 011 Estimated Afr/Ap 19 Apr 016/017 Predicted Afr/Ap 20 Apr-22 Apr 009/010-006/008-023/035
VI. Geomagnetic Activity Probabilities 20 Apr to 22 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 15% | 35% |
| Minor storm | 10% | 05% | 40% |
| Major-severe storm | 01% | 01% | 20% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 05% |
| Minor storm | 30% | 20% | 15% |
| Major-severe storm | 40% | 20% | 80% |
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 | 2025/04/20 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2025 | 134.2 -20.4 |
| April 2025 | 119.2 -15 |
| Last 30 days | 113.3 -31 |