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Solar activity report
Report of Solar-Geophysical Activity 2025 May 29 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 149 Issued at 2200Z on 29 May 2025IA. Analysis of Solar Active Regions and Activity from 28-2100Z to 29-2100Z Solar activity has been at low 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 and a slight chance for an X-class flare on
days one, two, and three (30 May, 31 May, 01 Jun).
IIA. Geophysical Activity Summary 28-2100Z to 29-2100Z
The geomagnetic
field has been at unsettled to severe storm levels for the past 24
hours. Solar wind speed reached a peak of 837 km/s at 29/1956Z. Total
IMF reached 25 nT at 29/0007Z. The maximum southward component of Bz
reached -24 nT at 29/0007Z. Electrons greater than 2 MeV at
geosynchronous orbit reached a peak level of 581 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at unsettled to major storm levels on day one (30 May) and quiet
to minor storm levels on days two and three (31 May, 01 Jun). Protons
have a slight chance of crossing threshold on days one, two, and three
(30 May, 31 May, 01 Jun).
III. Event Probabilities 30 May to 01 Jun
| Class M | 50% | 50% | 50% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 29 May 145 Predicted 30 May-01 Jun 138/135/135 90 Day Mean 29 May 154
V. Geomagnetic A Indices
Observed Afr/Ap 28 May 017/ N60 Estimated Afr/Ap 29 May 040/069 Predicted Afr/Ap 30 May-01 Jun 029/032-018/022-017/020
VI. Geomagnetic Activity Probabilities 30 May to 01 Jun
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 40% | 40% |
| Minor storm | 35% | 25% | 25% |
| Major-severe storm | 20% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 05% | 10% | 10% |
| Minor storm | 20% | 25% | 25% |
| Major-severe storm | 75% | 60% | 60% |
All times in UTC
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Space weather facts
| Last X-flare | 2025/06/19 | X1.9 |
| Last M-flare | 2025/10/03 | M1.2 |
| Last geomagnetic storm | 2025/10/03 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| September 2025 | 129.8 -3.7 |
| October 2025 | 140.1 +10.3 |
| Last 30 days | 131.3 -1.2 |