:Product: 0530RSGA.txt :Issued: 2025 May 30 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 150 Issued at 2200Z on 30 May 2025 IA. Analysis of Solar Active Regions and Activity from 29/2100Z to 30/2100Z: Solar activity has been at moderate levels for the past 24 hours. There are currently 6 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 (31 May, 01 Jun, 02 Jun). IIA. Geophysical Activity Summary 29/2100Z to 30/2100Z: The geomagnetic field has been at unsettled to minor storm levels for the past 24 hours. Solar wind speed reached a peak of 848 km/s at 30/0655Z. Total IMF reached 7 nT at 30/0853Z. The maximum southward component of Bz reached -7 nT at 30/0011Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 4876 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at unsettled to minor storm levels on day one (31 May), quiet to minor storm levels on day two (01 Jun) and quiet to unsettled levels on day three (02 Jun). Protons have a slight chance of crossing threshold on days one, two, and three (31 May, 01 Jun, 02 Jun). III. Event probabilities 31 May-02 Jun Class M 50/50/50 Class X 10/10/10 Proton 10/10/10 PCAF green IV. Penticton 10.7 cm Flux Observed 30 May 157 Predicted 31 May-02 Jun 155/150/145 90 Day Mean 30 May 154 V. Geomagnetic A Indices Observed Afr/Ap 29 May 038/ 33 Estimated Afr/Ap 30 May 028/036 Predicted Afr/Ap 31 May-02 Jun 016/022-017/020-013/015 VI. Geomagnetic Activity Probabilities 31 May-02 Jun A. Middle Latitudes Active 40/40/30 Minor Storm 25/25/15 Major-severe storm 05/05/01 B. High Latitudes Active 10/10/15 Minor Storm 25/25/30 Major-severe storm 60/60/45