:Product: 0605RSGA.txt :Issued: 2025 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 2025 IA. Analysis of Solar Active Regions and Activity from 04/2100Z to 05/2100Z: Solar activity has been at moderate levels for the past 24 hours. There are currently 5 numbered sunspot regions on the disk. IB. Solar Activity Forecast: Solar activity is expected to be low with a chance for M-class flares 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 active levels for the past 24 hours. Solar wind speed reached a peak of 765 km/s at 04/2240Z. Total IMF reached 8 nT at 04/2114Z. The maximum southward component of Bz reached -3 nT at 05/1706Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 2215 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on days one and three (06 Jun, 08 Jun) and quiet to minor storm levels on day two (07 Jun). III. Event probabilities 06 Jun-08 Jun Class M 40/40/40 Class X 05/05/05 Proton 05/05/05 PCAF green IV. Penticton 10.7 cm Flux Observed 05 Jun 128 Predicted 06 Jun-08 Jun 128/128/125 90 Day Mean 05 Jun 153 V. Geomagnetic A Indices Observed Afr/Ap 04 Jun 017/ 026 Estimated Afr/Ap 05 Jun 010/014 Predicted Afr/Ap 06 Jun-08 Jun 014/015-014/018-014/015 VI. Geomagnetic Activity Probabilities 06 Jun-08 Jun A. Middle Latitudes Active 35/35/35 Minor Storm 15/25/15 Major-severe storm 01/05/01 B. High Latitudes Active 15/10/15 Minor Storm 30/25/30 Major-severe storm 50/60/50