:Product: Report of Solar-Geophysical Activity :Issued: 2026 Jun 03 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 154 Issued at 2200Z on 03 Jun 2026 IA. Analysis of Solar Active Regions and Activity from 02/2100Z to 03/2100Z: Solar activity has been at high levels for the past 24 hours. There are currently 8 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 (04 Jun, 05 Jun, 06 Jun). IIA. Geophysical Activity Summary 02/2100Z to 03/2100Z: The geomagnetic field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 457 km/s at 03/1047Z. Total IMF reached 11 nT at 03/2049Z. The maximum southward component of Bz reached -8 nT at 03/2046Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 745 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at unsettled to severe storm levels on day one (04 Jun), active to severe storm levels on day two (05 Jun) and unsettled to active levels on day three (06 Jun). Protons have a slight chance of crossing threshold on days one, two, and three (04 Jun, 05 Jun, 06 Jun). III. Event probabilities 04 Jun-06 Jun Class M 60/60/60 Class X 15/15/15 Proton 10/10/10 PCAF green IV. Penticton 10.7 cm Flux Observed 03 Jun 147 Predicted 04 Jun-06 Jun 150/148/142 90 Day Mean 03 Jun 125 V. Geomagnetic A Indices Observed Afr/Ap 02 Jun 007/007 Estimated Afr/Ap 03 Jun 010/012 Predicted Afr/Ap 04 Jun-06 Jun 028/045-039/062-017/020 VI. Geomagnetic Activity Probabilities 04 Jun-06 Jun A. Middle Latitudes Active 25/25/35 Minor Storm 25/20/15 Major-severe storm 45/40/05 B. High Latitudes Active 05/05/10 Minor Storm 15/20/30 Major-severe storm 79/75/60