:Product: 0727RSGA.txt
:Issued: 2026 Jul 27 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 208 Issued at 2200Z on 27 Jul 2026

IA.  Analysis of Solar Active Regions and Activity from 26/2100Z to
27/2100Z: 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 (28 Jul, 29 Jul, 30 Jul).

IIA.  Geophysical Activity Summary 26/2100Z to 27/2100Z: The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 440 km/s at 26/2200Z. Total IMF reached 8 nT at
27/1800Z. The maximum southward component of Bz reached -5 nT around
27/2100Z.  Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 1379 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet to active levels on day one (28 Jul) and quiet to
unsettled levels on days two and three (29 Jul, 30 Jul).

III.  Event probabilities 28 Jul-30 Jul
Class M    40/40/40
Class X    10/10/10
Proton     05/05/05
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           27 Jul 147
Predicted   28 Jul-30 Jul 150/145/140
90 Day Mean        27 Jul 133

V.  Geomagnetic A Indices
Observed Afr/Ap 26 Jul  008/006
Estimated Afr/Ap 27 Jul  006/008
Predicted Afr/Ap 28 Jul-30 Jul  013/015-007/008-007/008

VI.  Geomagnetic Activity Probabilities 28 Jul-30 Jul
A.  Middle Latitudes
Active                30/20/15
Minor Storm           10/05/05
Major-severe storm    01/01/01
B.  High Latitudes
Active                15/15/15
Minor Storm           30/30/25
Major-severe storm    40/25/25