:Product: 0421RSGA.txt
:Issued: 2020 Apr 21 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 112 Issued at 2200Z on 21 Apr 2020

IA.  Analysis of Solar Active Regions and Activity from 20/2100Z to
21/2100Z: 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 (22 Apr, 23 Apr, 24 Apr).

IIA.  Geophysical Activity Summary 20/2100Z to 21/2100Z: The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed reached a peak of 458 km/s at 21/2053Z. Total IMF reached 15
nT at 21/0240Z. The maximum southward component of Bz reached -9 nT at
21/1542Z.  Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 190 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet to unsettled levels on days one and two (22 Apr, 23 Apr)
and quiet levels on day three (24 Apr).

III.  Event probabilities 22 Apr-24 Apr
Class M    01/01/01
Class X    01/01/01
Proton     01/01/01
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           21 Apr 069
Predicted   22 Apr-24 Apr 069/069/069
90 Day Mean        21 Apr 071

V.  Geomagnetic A Indices
Observed Afr/Ap 20 Apr  016/023
Estimated Afr/Ap 21 Apr  009/010
Predicted Afr/Ap 22 Apr-24 Apr  007/008-007/010-006/005

VI.  Geomagnetic Activity Probabilities 22 Apr-24 Apr
A.  Middle Latitudes
Active                15/20/10
Minor Storm           05/05/01
Major-severe storm    01/01/01
B.  High Latitudes
Active                15/15/15
Minor Storm           25/25/20
Major-severe storm    25/30/10