:Product: Report of Solar-Geophysical Activity
:Issued: 2026 Oct 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 300 Issued at 2200Z on 27 Oct 2026

IA.  Analysis of Solar Active Regions and Activity from 26/2100Z to
27/2100Z: Solar activity has been at very low levels for the past 24
hours.
IB.  Solar Activity Forecast: NA

IIA.  Geophysical Activity Summary 26/2100Z to 27/2100Z: The geomagnetic
field has been at NA levels for the past 24 hours. Solar wind speed
reached a peak of 379 km/s at 26/2120Z. Total IMF reached 9 nT at
26/2146Z. The maximum southward component of Bz reached -2 nT at
26/2121Z.
IIB.  Geophysical Activity Forecast: The geomagnetic field is expected
to be at quiet levels on days one, two, and three (28 Oct, 29 Oct, 30
Oct). Protons greater than 10 Mev NA.

III.  Event probabilities 28 Oct-30 Oct
Class M    05/05/05
Class X    01/01/01
Proton     01/01/01
PCAF       green

IV.  Penticton 10.7 cm Flux
Observed           27 Oct 089
Predicted   28 Oct-30 Oct 88/90/92
90 Day Mean        27 Oct 112

V.  Geomagnetic A Indices
Observed Afr/Ap 26 Oct  003/004
Estimated Afr/Ap 27 Oct  007/007
Predicted Afr/Ap 28 Oct-30 Oct  005/005-006/005-007/008

VI.  Geomagnetic Activity Probabilities 28 Oct-30 Oct
A.  Middle Latitudes
Active                10/10/15
Minor Storm           05/05/05
Major-severe storm    01/01/01
B.  High Latitudes
Active                15/15/15
Minor Storm           15/15/25
Major-severe storm    15/15/25