Solar activity report
Below you'll find a daily report brought to you by the NOAA about the solar activity and auroral activity during the past day and the prediction for the coming days. This page is daily updated around midnight.
Report of Solar-Geophysical Activity 2025 May 01 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 121 Issued at 2200Z on 01 May 2025IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 01-2100Z
Solar activity has been at low levels for the past 24 hours.
There are currently 3 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a chance for M-class flares and a slight chance for an X-class flare on
days one and two (02 May, 03 May) and expected to be low with a chance
for M-class flares on day three (04 May).
IIA. Geophysical Activity Summary 30-2100Z to 01-2100Z
The geomagnetic
field has been at unsettled to minor storm levels for the past 24 hours.
Solar wind speed reached a peak of 501 km/s at 01/1702Z. Total IMF
reached 12 nT at 01/1750Z. The maximum southward component of Bz reached
-10 nT at 01/1626Z. Electrons greater than 2 MeV at geosynchronous
orbit reached a peak level of 340 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at unsettled to active levels on day one (02 May), quiet to
unsettled levels on day two (03 May) and quiet to active levels on day
three (04 May).
III. Event Probabilities 02 May to 04 May
| Class M | 50% | 45% | 45% |
| Class X | 10% | 10% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 01 May 152 Predicted 02 May-04 May 150/145/145 90 Day Mean 01 May 170
V. Geomagnetic A Indices
Observed Afr/Ap 30 Apr 014/ 014 Estimated Afr/Ap 01 May 018/026 Predicted Afr/Ap 02 May-04 May 013/018-007/010-012/012
VI. Geomagnetic Activity Probabilities 02 May to 04 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 30% | 40% |
| Minor storm | 25% | 10% | 20% |
| Major-severe storm | 05% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 30% | 30% | 30% |
| Major-severe storm | 55% | 40% | 55% |
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Space weather facts
| Last X-flare | 2025/03/28 | X1.1 |
| Last M-flare | 2025/04/30 | M2.03 |
| Last geomagnetic storm | 2025/05/01 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| April 2025 | 140.6 +6.4 |
| May 2025 | 59 -81.6 |
| Last 30 days | 119.9 -9.8 |