:Product: Report of Solar-Geophysical Activity
:Issued: 2026 Jun 22 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 173 Issued at 2200Z on 22 Jun 2026

IA.  Analysis of Solar Active Regions and Activity from 21/2100Z to
22/2100Z: Solar activity has been at low 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 (23 Jun, 24 Jun,
25 Jun).

IIA.  Geophysical Activity Summary 21/2100Z to 22/2100Z: The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 358 km/s at 21/2314Z. Total IMF reached 8 nT at
22/2059Z. The maximum southward component of Bz reached -4 nT at
21/2343Z.  Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 628 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet levels on day one (23 Jun) and quiet to active levels on
days two and three (24 Jun, 25 Jun).

III.  Event probabilities 23 Jun-25 Jun
Class M    30/35/35
Class X    05/05/05
Proton     05/05/05
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           22 Jun 122
Predicted   23 Jun-25 Jun 125/125/130
90 Day Mean        22 Jun 126

V.  Geomagnetic A Indices
Observed Afr/Ap 21 Jun  007/005
Estimated Afr/Ap 22 Jun  005/005
Predicted Afr/Ap 23 Jun-25 Jun  006/005-009/012-013/015

VI.  Geomagnetic Activity Probabilities 23 Jun-25 Jun
A.  Middle Latitudes
Active                10/35/35
Minor Storm           01/20/20
Major-severe storm    01/05/05
B.  High Latitudes
Active                15/10/10
Minor Storm           20/25/25
Major-severe storm    10/50/50