Viewing archive of Sunday, 25 May 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 May 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 145 Issued at 2200Z on 25 May 2025IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z Solar activity has been at high levels for the past 24 hours.
There are currently 7 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a chance for X-class flares on days one, two, and three (26 May, 27
May, 28 May).
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 508 km/s at 25/0215Z. Total IMF reached 11 nT at
25/0648Z. The maximum southward component of Bz reached -5 nT at
25/1157Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 1038 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on days one and two (26 May, 27 May)
and quiet to active levels on day three (28 May). Protons have a slight
chance of crossing threshold on days one, two, and three (26 May, 27
May, 28 May).
III. Event Probabilities 26 May to 28 May
| Class M | 65% | 65% | 65% |
| Class X | 25% | 25% | 25% |
| Proton | 10% | 10% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 25 May 133 Predicted 26 May-28 May 135/130/125 90 Day Mean 25 May 155
V. Geomagnetic A Indices
Observed Afr/Ap 24 May 006/005 Estimated Afr/Ap 25 May 007/008 Predicted Afr/Ap 26 May-28 May 009/008-008/008-010/012
VI. Geomagnetic Activity Probabilities 26 May to 28 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 30% |
| Minor storm | 05% | 05% | 15% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 25% | 30% |
| Major-severe storm | 25% | 25% | 40% |
All times in UTC
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Space weather facts
| Last X-flare | 2025/12/01 | X1.9 |
| Last M-flare | 2025/12/06 | M8.1 |
| Last geomagnetic storm | 2025/12/04 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| November 2025 | 91.8 -22.8 |
| December 2025 | 167.7 +75.9 |
| Last 30 days | 107.1 +13.7 |