:Product: Report of Solar-Geophysical Activity
:Issued: 2026 Jun 28 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 179 Issued at 2200Z on 28 Jun 2026

IA.  Analysis of Solar Active Regions and Activity from 27/2100Z to
28/2100Z: Solar activity has been at low levels for the past 24 hours.
There are currently 6 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 (29 Jun, 30 Jun, 01 Jul).

IIA.  Geophysical Activity Summary 27/2100Z to 28/2100Z: The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 544 km/s at 28/0138Z.  Electrons greater than 2 MeV at
geosynchronous orbit reached a peak level of 2637 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet to minor storm levels on days one and two (29 Jun, 30
Jun) and quiet to active levels on day three (01 Jul).

III.  Event probabilities 29 Jun-01 Jul
Class M    50/50/50
Class X    10/10/10
Proton     05/05/05
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           28 Jun 186
Predicted   29 Jun-01 Jul 175/180/175
90 Day Mean        28 Jun 127

V.  Geomagnetic A Indices
Observed Afr/Ap 27 Jun  008/007
Estimated Afr/Ap 28 Jun  009/010
Predicted Afr/Ap 29 Jun-01 Jul  008/010-018/025-011/012

VI.  Geomagnetic Activity Probabilities 29 Jun-01 Jul
A.  Middle Latitudes
Active                30/45/35
Minor Storm           25/30/20
Major-severe storm    05/05/05
B.  High Latitudes
Active                10/05/10
Minor Storm           20/30/25
Major-severe storm    55/65/55