:Product: Report of Solar-Geophysical Activity
:Issued: 2026 Jun 16 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 167 Issued at 2200Z on 16 Jun 2026

IA.  Analysis of Solar Active Regions and Activity from 15/2100Z to
16/2100Z: 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 slight chance for an M-class flare on days one, two, and three (17
Jun, 18 Jun, 19 Jun).

IIA.  Geophysical Activity Summary 15/2100Z to 16/2100Z: The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 487 km/s at 16/0317Z. Total IMF reached 8 nT at
16/1327Z. The maximum southward component of Bz reached -7 nT at
16/1347Z.  Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 2043 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet to active levels on days one and three (17 Jun, 19 Jun)
and quiet to unsettled levels on day two (18 Jun).

III.  Event probabilities 17 Jun-19 Jun
Class M    15/15/15
Class X    01/01/01
Proton     01/01/01
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           16 Jun 113
Predicted   17 Jun-19 Jun 113/115/115
90 Day Mean        16 Jun 126

V.  Geomagnetic A Indices
Observed Afr/Ap 15 Jun  006/006
Estimated Afr/Ap 16 Jun  007/007
Predicted Afr/Ap 17 Jun-19 Jun  010/012-008/010-015/015

VI.  Geomagnetic Activity Probabilities 17 Jun-19 Jun
A.  Middle Latitudes
Active                30/20/35
Minor Storm           15/05/20
Major-severe storm    01/01/05
B.  High Latitudes
Active                15/15/10
Minor Storm           25/25/30
Major-severe storm    40/30/50