:Product: 0910RSGA.txt
:Issued: 2021 Sep 10 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 253 Issued at 2200Z on 10 Sep 2021

IA.  Analysis of Solar Active Regions and Activity from 09/2100Z to
10/2100Z: Solar activity has been at very low levels for the past 24
hours. There are currently 5 numbered sunspot regions on the disk.
IB.  Solar Activity Forecast: Solar activity is expected to be low with
a slight chance for an M-class flare on days one, two, and three (11
Sep, 12 Sep, 13 Sep).

IIA.  Geophysical Activity Summary 09/2100Z to 10/2100Z: The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 392 km/s at 10/0730Z. Total IMF reached 12
nT at 10/1702Z. The maximum southward component of Bz reached -5 nT at
10/1945Z.  Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 306 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet to active levels on day one (11 Sep), quiet to unsettled
levels on day two (12 Sep) and quiet levels on day three (13 Sep).

III.  Event probabilities 11 Sep-13 Sep
Class M    20/20/20
Class X    05/05/05
Proton     01/01/01
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           10 Sep 096
Predicted   11 Sep-13 Sep 094/092/092
90 Day Mean        10 Sep 081

V.  Geomagnetic A Indices
Observed Afr/Ap 09 Sep  007/004
Estimated Afr/Ap 10 Sep  007/008
Predicted Afr/Ap 11 Sep-13 Sep  014/014-008/008-006/005

VI.  Geomagnetic Activity Probabilities 11 Sep-13 Sep
A.  Middle Latitudes
Active                30/15/10
Minor Storm           10/05/01
Major-severe storm    01/01/01
B.  High Latitudes
Active                15/15/15
Minor Storm           30/25/20
Major-severe storm    40/25/20