:Product: 0523RSGA.txt
:Issued: 2025 May 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 143 Issued at 2200Z on 23 May 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 9 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 May, 25 May,
26 May).

IIA.  Geophysical Activity Summary 22/2100Z to 23/2100Z: The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 556 km/s at 23/0855Z. Total IMF reached 8 nT at
23/1722Z. The maximum southward component of Bz reached -5 nT at
23/1506Z.  Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 1707 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet to active levels on days one, two, and three (24 May, 25
May, 26 May).

III.  Event probabilities 24 May-26 May
Class M    25/25/25
Class X    05/05/05
Proton     01/01/01
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           23 May 122
Predicted   24 May-26 May 120/120/130
90 Day Mean        23 May 157

V.  Geomagnetic A Indices
Observed Afr/Ap 22 May  007/ 006
Estimated Afr/Ap 23 May  007/008
Predicted Afr/Ap 24 May-26 May  011/012-010/012-010/012

VI.  Geomagnetic Activity Probabilities 24 May-26 May
A.  Middle Latitudes
Active                30/30/30
Minor Storm           10/10/10
Major-severe storm    01/01/01
B.  High Latitudes
Active                15/15/15
Minor Storm           25/25/25
Major-severe storm    40/40/40
