:Product: Report of Solar-Geophysical Activity
:Issued: 2026 Jun 25 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 176 Issued at 2200Z on 25 Jun 2026

IA.  Analysis of Solar Active Regions and Activity from 24/2100Z to
25/2100Z: Solar activity has been at low levels for the past 24 hours.
There are currently 8 numbered sunspot regions on the disk.
IB.  Solar Activity Forecast: Solar activity is expected to be low with
a chance for M-class flares and a slight chance for an X-class flare on
days one, two, and three (26 Jun, 27 Jun, 28 Jun).

IIA.  Geophysical Activity Summary 24/2100Z to 25/2100Z: The geomagnetic
field has been at unsettled to minor storm levels for the past 24 hours.
Solar wind speed reached a peak of 729 km/s at 25/1926Z. Total IMF
reached 13 nT at 24/2251Z. The maximum southward component of Bz reached
-10 nT at 25/0026Z.  Electrons greater than 2 MeV at geosynchronous
orbit reached a peak level of 479 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet to active levels on days one, two, and three (26 Jun, 27
Jun, 28 Jun).

III.  Event probabilities 26 Jun-28 Jun
Class M    50/50/50
Class X    10/10/10
Proton     05/05/05
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           25 Jun 156
Predicted   26 Jun-28 Jun 155/155/155
90 Day Mean        25 Jun 126

V.  Geomagnetic A Indices
Observed Afr/Ap 24 Jun  011/015
Estimated Afr/Ap 25 Jun  018/026
Predicted Afr/Ap 26 Jun-28 Jun  010/012-011/012-012/015

VI.  Geomagnetic Activity Probabilities 26 Jun-28 Jun
A.  Middle Latitudes
Active                35/35/35
Minor Storm           20/20/20
Major-severe storm    05/05/05
B.  High Latitudes
Active                10/10/10
Minor Storm           30/30/30
Major-severe storm    50/50/50