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Solar activity report
Report of Solar-Geophysical Activity 2026 Jun 04 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 155 Issued at 2200Z on 04 Jun 2026IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z 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 (05 Jun, 06 Jun, 07 Jun).
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 481 km/s at 03/2131Z. Total IMF reached 11
nT at 03/2257Z. The maximum southward component of Bz reached -9 nT at
04/0121Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 552 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at active to severe storm levels on day one (05 Jun), quiet to
active levels on day two (06 Jun) and quiet to unsettled levels on day
three (07 Jun).
III. Event Probabilities 05 Jun to 07 Jun
| Class M | 50% | 50% | 50% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 04 Jun 148 Predicted 05 Jun-07 Jun 145/143/140 90 Day Mean 04 Jun 125
V. Geomagnetic A Indices
Observed Afr/Ap 03 Jun 011/010 Estimated Afr/Ap 04 Jun 023/041 Predicted Afr/Ap 05 Jun-07 Jun 042/055-018/020-010/012
VI. Geomagnetic Activity Probabilities 05 Jun to 07 Jun
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 35% | 15% |
| Minor storm | 20% | 15% | 05% |
| Major-severe storm | 40% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 05% | 10% | 15% |
| Minor storm | 20% | 30% | 25% |
| Major-severe storm | 75% | 60% | 20% |
All times in UTC
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Space weather facts
| Last X-flare | 2026/06/03 | X1.0 |
| Last M-flare | 2026/06/03 | M7.76 |
| Last geomagnetic storm | 2026/05/16 | Kp6- (G2) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (2%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| April 2026 | 79.3 -6.6 |
| June 2026 | 144.3 +65 |
| Last 30 days | 99 +5.2 |
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