:Product: Forecast Discussion
:Issued: 2025 Oct 31 1230 UTC
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
#
Solar Activity

.24 hr Summary...
Solar activity reached low levels due to a C1.4 flare at 30/1237 UTC
following a small filament eruption near the Suns W limb and multiple
low level C-flares just beyond the E limb. Slight decay was observed in
Regions 4261 (S06W74, Hrx/alpha), 4266 (N17W57, Bxo/beta), and 4267
(N02W32, Cso/beta).

An approximate 12 degree filament eruption, centered near N21E32,
occurred at 30/0645 UTC. The resulting CME was somewhat obscured in
SOHO/LASCO coronagraph imagery due to another eruption beyond the NE
limb, but appeared in C2 imagery at 30/1325 UTC. A reanalysis is
pending.

.Forecast...
Solar activity is expected to remain very low with a chance for C-class
flares through 01 Nov. C-class flares become likely, with a slight
chance for M-class flares on 02 Nov due to the anticipated return of
active regions to the eastern limb.

Energetic Particle

.24 hr Summary...
The greater than 2 MeV electron flux was at normal to moderate levels.
The greater than 10 MeV proton flux was at background levels.

.Forecast...
The greater than 2 MeV electron flux is expected to reach moderate
levels with a chance for high levels on 31 Oct - 02 Nov due to HSS
influence. The greater than 10 MeV proton flux is expected to remain at
background levels through 02 Nov.

Solar Wind

.24 hr Summary...
Solar wind conditions continued to be enhanced under positive polarity
CH HSS influence. Solar wind speed increased from approximately 510 km/s
to around the 650-750 km/s range. Total field decreased from 13 nT to 8
nT while the Bz component was between +11/-12 nT. Phi angle was
predominantly positive.

.Forecast...
Solar wind parameters are expected to continue to reflect positive
CH/HSS influences through 02 Nov. Weak enhancements from the periphery
of a CME that left the Sun on 29 Oct is possible on 02 Nov.

Geospace

.24 hr Summary...
The geomagnetic field was at unsettled to G1 (Minor) storm levels due to
persistent CH HSS effects.

.Forecast...
The geomagnetic field is expected to continue at unsettled to G1 (Minor)
levels on 31 Oct with mostly unsettled to active levels through 02 Nov
as HSS activity persists.