:Product: 0605RSGA.txt :Issued: 2026 Jun 05 2200 UTC # Prepared jointly by the U.S. Dept. of Commerce, NOAA, # Space Weather Prediction Center and the U.S. Air Force. # Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 156 Issued at 2200Z on 05 Jun 2026 IA. Analysis of Solar Active Regions and Activity from 04/2100Z to 05/2100Z: 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 (06 Jun, 07 Jun, 08 Jun). IIA. Geophysical Activity Summary 04/2100Z to 05/2100Z: The geomagnetic field has been at quiet to major storm levels for the past 24 hours. Solar wind speed reached a peak of 758 km/s at 05/2012Z. Total IMF reached 20 nT at 05/1222Z. The maximum southward component of Bz reached -17 nT at 05/1233Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 535 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to major storm levels on day one (06 Jun) and quiet to unsettled levels on days two and three (07 Jun, 08 Jun). III. Event probabilities 06 Jun-08 Jun Class M 50/50/50 Class X 10/10/10 Proton 05/05/05 PCAF green IV. Penticton 10.7 cm Flux Observed 05 Jun 141 Predicted 06 Jun-08 Jun 142/140/140 90 Day Mean 05 Jun 125 V. Geomagnetic A Indices Observed Afr/Ap 04 Jun 007/006 Estimated Afr/Ap 05 Jun 025/044 Predicted Afr/Ap 06 Jun-08 Jun 020/027-008/010-008/008 VI. Geomagnetic Activity Probabilities 06 Jun-08 Jun A. Middle Latitudes Active 25/20/20 Minor Storm 45/05/05 Major-severe storm 30/01/01 B. High Latitudes Active 05/20/15 Minor Storm 15/30/25 Major-severe storm 85/25/25