:Product: 0911RSGA.txt
:Issued: 2021 Sep 11 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 254 Issued at 2200Z on 11 Sep 2021

IA.  Analysis of Solar Active Regions and Activity from 10/2100Z to
11/2100Z: Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C1 event observed at
11/0519Z from Region 2868 (S19W49). 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 (12
Sep, 13 Sep, 14 Sep).

IIA.  Geophysical Activity Summary 10/2100Z to 11/2100Z: The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed reached a peak of 381 km/s at 11/0315Z. Total IMF reached 13
nT at 11/0438Z. The maximum southward component of Bz reached -10 nT at
10/2244Z.  Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 150 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet to unsettled levels on day one (12 Sep) and quiet levels
on days two and three (13 Sep, 14 Sep).

III.  Event probabilities 12 Sep-14 Sep
Class M    20/20/20
Class X    05/05/05
Proton     01/01/01
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           11 Sep 092
Predicted   12 Sep-14 Sep 092/090/086
90 Day Mean        11 Sep 081

V.  Geomagnetic A Indices
Observed Afr/Ap 10 Sep  009/007
Estimated Afr/Ap 11 Sep  006/007
Predicted Afr/Ap 12 Sep-14 Sep  008/008-006/005-006/005

VI.  Geomagnetic Activity Probabilities 12 Sep-14 Sep
A.  Middle Latitudes
Active                15/10/10
Minor Storm           05/01/01
Major-severe storm    01/01/01
B.  High Latitudes
Active                15/15/15
Minor Storm           25/20/20
Major-severe storm    25/20/20