:Product: 0620RSGA.txt
:Issued: 2026 Jun 20 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 171 Issued at 2200Z on 20 Jun 2026

IA.  Analysis of Solar Active Regions and Activity from 19/2100Z to
20/2100Z: Solar activity has been at moderate 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 chance for M-class flares on days one, two, and three (21 Jun, 22 Jun,
23 Jun).

IIA.  Geophysical Activity Summary 19/2100Z to 20/2100Z: The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 450 km/s at 20/0613Z. Total IMF reached 8
nT at 19/2122Z. The maximum southward component of Bz reached -6 nT at
20/0953Z.  Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 579 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet to unsettled levels on day one (21 Jun) and quiet levels
on days two and three (22 Jun, 23 Jun).

III.  Event probabilities 21 Jun-23 Jun
Class M    35/35/35
Class X    01/01/01
Proton     01/01/01
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           20 Jun 113
Predicted   21 Jun-23 Jun 115/120/120
90 Day Mean        20 Jun 126

V.  Geomagnetic A Indices
Observed Afr/Ap 19 Jun  009/007
Estimated Afr/Ap 20 Jun  007/008
Predicted Afr/Ap 21 Jun-23 Jun  008/008-006/005-006/005

VI.  Geomagnetic Activity Probabilities 21 Jun-23 Jun
A.  Middle Latitudes
Active                20/10/10
Minor Storm           05/01/01
Major-severe storm    01/01/01
B.  High Latitudes
Active                20/15/15
Minor Storm           25/20/20
Major-severe storm    25/10/10