:Product: 0601RSGA.txt :Issued: 2026 Jun 01 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 152 Issued at 2200Z on 01 Jun 2026 IA. 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 10 numbered sunspot regions on the disk. IB. Solar Activity Forecast: Solar activity is expected to be low with a slight chance for an M-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 quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 494 km/s at 31/2150Z. Total IMF reached 7 nT at 01/1844Z. The maximum southward component of Bz reached -6 nT at 01/1415Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 550 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels on day one (02 Jun), quiet to active levels on day two (03 Jun) and unsettled to active levels on day three (04 Jun). III. Event probabilities 02 Jun-04 Jun Class M 20/20/20 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 01 Jun 132 Predicted 02 Jun-04 Jun 128/130/127 90 Day Mean 01 Jun 125 V. Geomagnetic A Indices Observed Afr/Ap 31 May 008/011 Estimated Afr/Ap 01 Jun 010/012 Predicted Afr/Ap 02 Jun-04 Jun 006/007-011/012-012/014 VI. Geomagnetic Activity Probabilities 02 Jun-04 Jun A. Middle Latitudes Active 20/30/35 Minor Storm 05/10/15 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/10 Minor Storm 30/30/30 Major-severe storm 25/30/50