:Product: 0627RSGA.txt
:Issued: 2026 Jun 27 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 178 Issued at 2200Z on 27 Jun 2026

IA.  Analysis of Solar Active Regions and Activity from 26/2100Z to
27/2100Z: 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 (28 Jun, 29 Jun, 30 Jun).

IIA.  Geophysical Activity Summary 26/2100Z to 27/2100Z: The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 656 km/s at 27/0355Z.  Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 3792 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet to active levels on days one and three (28 Jun, 30 Jun)
and quiet levels on day two (29 Jun).

III.  Event probabilities 28 Jun-30 Jun
Class M    50/50/50
Class X    10/10/10
Proton     05/05/05
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           27 Jun 188
Predicted   28 Jun-30 Jun 175/175/180
90 Day Mean        27 Jun 126

V.  Geomagnetic A Indices
Observed Afr/Ap 26 Jun  013/011
Estimated Afr/Ap 27 Jun  008/009
Predicted Afr/Ap 28 Jun-30 Jun  012/015-006/005-018/020

VI.  Geomagnetic Activity Probabilities 28 Jun-30 Jun
A.  Middle Latitudes
Active                35/10/40
Minor Storm           20/01/20
Major-severe storm    05/01/05
B.  High Latitudes
Active                10/15/10
Minor Storm           30/20/25
Major-severe storm    50/10/60