:Product: Report of Solar-Geophysical Activity
:Issued: 2026 Apr 08 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 98 Issued at 2200Z on 08 Apr 2026

IA.  Analysis of Solar Active Regions and Activity from 07/2100Z to
08/2100Z: Solar activity has been at low levels for the past 24 hours.
There are currently 7 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 and two (09 Apr, 10 Apr) and expected to be low with a chance
for M-class flares on day three (11 Apr).

IIA.  Geophysical Activity Summary 07/2100Z to 08/2100Z: The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 453 km/s at 08/0106Z. Total IMF reached 6
nT at 08/1358Z. The maximum southward component of Bz reached -5 nT at
07/2221Z.  Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 7322 pfu.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet to unsettled levels on day one (09 Apr), quiet to minor
storm levels on day two (10 Apr) and active to minor storm levels on day
three (11 Apr). Protons have a slight chance of crossing threshold on
days one, two, and three (09 Apr, 10 Apr, 11 Apr).

III.  Event probabilities 09 Apr-11 Apr
Class M    35/35/25
Class X    10/10/05
Proton     10/10/10
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           08 Apr 108
Predicted   09 Apr-11 Apr 105/100/095
90 Day Mean        08 Apr 136

V.  Geomagnetic A Indices
Observed Afr/Ap 07 Apr  007/009
Estimated Afr/Ap 08 Apr  006/008
Predicted Afr/Ap 09 Apr-11 Apr  007/008-015/024-023/032

VI.  Geomagnetic Activity Probabilities 09 Apr-11 Apr
A.  Middle Latitudes
Active                15/40/35
Minor Storm           01/25/30
Major-severe storm    01/01/10
B.  High Latitudes
Active                15/10/10
Minor Storm           25/25/25
Major-severe storm    20/60/65