:Product: 1218RSGA.txt
:Issued: 2020 Dec 18 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 353 Issued at 2200Z on 18 Dec 2020

IA.  Analysis of Solar Active Regions and Activity from 17/2100Z to
18/2100Z: Solar activity has been at very low levels for the past 24
hours. There are currently 0 numbered sunspot regions on the disk.
IB.  Solar Activity Forecast: Solar activity is expected to be very low
on days one, two, and three (19 Dec, 20 Dec, 21 Dec).

IIA.  Geophysical Activity Summary 17/2100Z to 18/2100Z: The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 301 km/s at 18/1807Z. Total IMF reached 7 nT at
18/1113Z. The maximum southward component of Bz reached -6 nT at
18/1356Z.  Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 251 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet levels on days one and two (19 Dec, 20 Dec) and quiet to
active levels on day three (21 Dec).

III.  Event probabilities 19 Dec-21 Dec
Class M    01/01/01
Class X    01/01/01
Proton     01/01/01
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           18 Dec 082
Predicted   19 Dec-21 Dec 082/082/082
90 Day Mean        18 Dec 082

V.  Geomagnetic A Indices
Observed Afr/Ap 17 Dec  002/000
Estimated Afr/Ap 18 Dec  002/003
Predicted Afr/Ap 19 Dec-21 Dec  005/005-006/005-010/012

VI.  Geomagnetic Activity Probabilities 19 Dec-21 Dec
A.  Middle Latitudes
Active                10/10/30
Minor Storm           01/01/10
Major-severe storm    01/01/01
B.  High Latitudes
Active                20/20/15
Minor Storm           20/20/30
Major-severe storm    10/10/40