:Product: 0623RSGA.txt :Issued: 2025 Jun 23 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 174 Issued at 2200Z on 23 Jun 2025 IA. Analysis of Solar Active Regions and Activity from 22/2100Z to 23/2100Z: Solar activity has been at low levels for the past 24 hours. There are currently 7 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 (24 Jun, 25 Jun, 26 Jun). IIA. Geophysical Activity Summary 22/2100Z to 23/2100Z: The geomagnetic field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 530 km/s at 22/2358Z. Total IMF reached 6 nT at 23/0039Z. The maximum southward component of Bz reached -5 nT at 23/0010Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 1271 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on day one (24 Jun), unsettled to major storm levels on day two (25 Jun) and unsettled to minor storm levels on day three (26 Jun). Protons have a slight chance of crossing threshold on days one, two, and three (24 Jun, 25 Jun, 26 Jun). III. Event probabilities 24 Jun-26 Jun Class M 35/35/35 Class X 10/10/10 Proton 10/10/10 PCAF green IV. Penticton 10.7 cm Flux Observed 23 Jun 122 Predicted 24 Jun-26 Jun 120/120/125 90 Day Mean 23 Jun 146 V. Geomagnetic A Indices Observed Afr/Ap 22 Jun 009/ 008 Estimated Afr/Ap 23 Jun 010/011 Predicted Afr/Ap 24 Jun-26 Jun 010/012-028/040-021/028 VI. Geomagnetic Activity Probabilities 24 Jun-26 Jun A. Middle Latitudes Active 30/30/35 Minor Storm 10/35/25 Major-severe storm 01/25/05 B. High Latitudes Active 15/05/10 Minor Storm 25/20/25 Major-severe storm 40/80/55