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Report of Solar-Geophysical Activity
:Product: Report of Solar-Geophysical Activity :Issued: 2026 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 2026 IA. Analysis of Solar Active Regions and Activity from 22/2100Z to 23/2100Z: Solar activity has been at very low 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 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 394 km/s at 23/2048Z. Total IMF reached 11 nT at 23/1858Z. The maximum southward component of Bz reached -7 nT at 23/1506Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 846 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on days one and two (24 Jun, 25 Jun) and quiet to unsettled levels on day three (26 Jun). III. Event probabilities 24 Jun-26 Jun Class M 25/30/30 Class X 05/05/05 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 23 Jun 130 Predicted 24 Jun-26 Jun 130/135/135 90 Day Mean 23 Jun 126 V. Geomagnetic A Indices Observed Afr/Ap 22 Jun 005/005 Estimated Afr/Ap 23 Jun 005/007 Predicted Afr/Ap 24 Jun-26 Jun 009/012-013/015-013/015 VI. Geomagnetic Activity Probabilities 24 Jun-26 Jun A. Middle Latitudes Active 35/35/35 Minor Storm 20/20/20 Major-severe storm 05/05/05 B. High Latitudes Active 10/10/10 Minor Storm 25/25/30 Major-severe storm 50/50/50Space Weather Alerts, Watches and Warnings
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