:Product: 0331RSGA.txt
:Issued: 2021 Mar 31 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 90 Issued at 2200Z on 31 Mar 2021

IA.  Analysis of Solar Active Regions and Activity from 30/2100Z to
31/2100Z: 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 (01 Apr, 02 Apr, 03 Apr).

IIA.  Geophysical Activity Summary 30/2100Z to 31/2100Z: The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 410 km/s at 30/2110Z. Total IMF reached 8
nT at 31/0755Z. The maximum southward component of Bz reached -6 nT at
31/0611Z.  Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 737 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet levels on days one, two, and three (01 Apr, 02 Apr, 03
Apr).

III.  Event probabilities 01 Apr-03 Apr
Class M    01/01/01
Class X    01/01/01
Proton     01/01/01
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           31 Mar 074
Predicted   01 Apr-03 Apr 075/070/070
90 Day Mean        31 Mar 076

V.  Geomagnetic A Indices
Observed Afr/Ap 30 Mar  004/002
Estimated Afr/Ap 31 Mar  009/010
Predicted Afr/Ap 01 Apr-03 Apr  006/005-005/005-005/005

VI.  Geomagnetic Activity Probabilities 01 Apr-03 Apr
A.  Middle Latitudes
Active                10/10/15
Minor Storm           01/01/05
Major-severe storm    01/01/01
B.  High Latitudes
Active                15/20/20
Minor Storm           15/20/25
Major-severe storm    05/10/20