Viewing archive of Monday, 28 April 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 Apr 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 118 Issued at 2200Z on 28 Apr 2025IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z
Solar activity has been at low levels for the past 24 hours.
There are currently 10 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a slight chance for an M-class flare on days one, two, and three (29
Apr, 30 Apr, 01 May).
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 535 km/s at 28/0705Z. Total IMF reached 9
nT at 28/0715Z. The maximum southward component of Bz reached -7 nT at
27/2225Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 631 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (29 Apr) and quiet levels
on days two and three (30 Apr, 01 May).
III. Event Probabilities 29 Apr to 01 May
| Class M | 15% | 15% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 28 Apr 154 Predicted 29 Apr-01 May 155/155/160 90 Day Mean 28 Apr 171
V. Geomagnetic A Indices
Observed Afr/Ap 27 Apr 007/ 006 Estimated Afr/Ap 28 Apr 006/007 Predicted Afr/Ap 29 Apr-01 May 007/008-006/005-005/005
VI. Geomagnetic Activity Probabilities 29 Apr to 01 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 10% | 10% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 20% | 20% |
| Major-severe storm | 30% | 20% | 20% |
All times in UTC
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Space weather facts
| Last X-flare | 2025/05/14 | X2.7 |
| Last M-flare | 2025/05/19 | M3.1 |
| Last geomagnetic storm | 2025/05/17 | Kp6+ (G2) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| April 2025 | 140.6 +6.4 |
| May 2025 | 68.9 -71.7 |
| Last 30 days | 92.7 -23.7 |