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Solar activity report
Report of Solar-Geophysical Activity 2025 Jun 01 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 152 Issued at 2200Z on 01 Jun 2025IA. Analysis of Solar Active Regions and Activity from 31-2100Z to 01-2100Z Solar activity has been at low levels for the past 24 hours.
There are currently 5 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a slight chance for an X-class flare on days one, two, and three
(02 Jun, 03 Jun, 04 Jun).
IIA. Geophysical Activity Summary 31-2100Z to 01-2100Z
The geomagnetic
field has been at active to severe storm levels for the past 24 hours.
Solar wind speed reached a peak of 1130 km/s at 01/1154Z. Total IMF
reached 27 nT at 01/1008Z. The maximum southward component of Bz reached
-23 nT at 01/0529Z. Protons greater than 10 MeV at geosynchronous orbit
reached a peak level of 666 pfu at 01/0915Z. Electrons greater than 2
MeV at geosynchronous orbit reached a peak level of 4397 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at active to severe storm levels on day one (02 Jun), active to
minor storm levels on day two (03 Jun) and unsettled to active levels on
day three (04 Jun). Protons are expected to cross threshold on day one
(02 Jun), are expected to cross threshold on day two (03 Jun) and are
likely to cross threshold on day three (04 Jun).
III. Event Probabilities 02 Jun to 04 Jun
| Class M | 65% | 65% | 65% |
| Class X | 15% | 15% | 15% |
| Proton | 99% | 75% | 60% |
| PCAF | yellow | ||
IV. Penticton 10.7 cm Flux
Observed 01 Jun 150 Predicted 02 Jun-04 Jun 150/150/150 90 Day Mean 01 Jun 154
V. Geomagnetic A Indices
Observed Afr/Ap 31 May 012/016 Estimated Afr/Ap 01 Jun 061/124 Predicted Afr/Ap 02 Jun-04 Jun 050/086-023/035-016/018
VI. Geomagnetic Activity Probabilities 02 Jun to 04 Jun
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 30% | 35% |
| Minor storm | 35% | 35% | 20% |
| Major-severe storm | 55% | 25% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 01% | 05% | 10% |
| Minor storm | 05% | 20% | 25% |
| Major-severe storm | 95% | 75% | 55% |
All times in UTC
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Space weather facts
| Last X-flare | 2026/01/18 | X1.9 |
| Last M-flare | 2026/01/21 | M3.4 |
| Last geomagnetic storm | 2026/01/22 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| December 2025 | 124 +32.2 |
| January 2026 | 119.1 -4.9 |
| Last 30 days | 122.3 +12.7 |