Subject: Weekly Highlights of Solar and Geomagnetic Activity, 27 October - 02 November 2025

:Product: Weekly Highlights and Forecasts
:Issued: 2025 Nov 03 0428 UTC
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# Weekly Highlights and Forecasts
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Highlights of Solar and Geomagnetic Activity
27 October - 02 November 2025

Solar activity was at low levels on 27 Oct - 01 Nov. Solar activity
reached moderate levels on 02 Nov due to a single M1.0 flare that
occurred at 02/0026 UTC from a region beyond the East limb and
became the largest flare of the week. All the active regions that
crossed the visible solar disk this week presented a simple magnetic configuration (alpha or beta) and an unremarkable overall activity.
Region 4267 (N04, L=60, class/area=Cso/120 on 28 Oct) was the most
flaring region during the week, with three C-class flares: a C1.6 at
28/1626 UTC, a C4.7 at 01/1655 UTC and a C8.2 at 02/1246 UTC. Three
Type-II radio bursts were observed on 29-31 Oct and were likely
associated with far-sided activity: 29/0012 UTC (est. speed 1,357
km/s), 30/0424 UTC (est. 691 km/s) and 31/2013 UTC (est. 542 km/s).

Multiple CMEs were observed in coronagraph imagery during the week,
but they were mostly far-sided. The CME that erupted around 30/0645
UTC from a region near N21E32 presented a potential Earth-directed
component, and its modeled propagation suggested a partial impact on Earth's magnetosphere arriving on 02 Nov. However, no clear CME
influences were observed on the solar wind data near-Earth during
the period.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit reached
the 1,000 pfu threashold around 31/1200 UTC and remained at high
levels until the end of the period. The maximum > 2MeV electron
flux of 1,260 pfu was observed on 02/1650 UTC by the GOES-19
satellite.

Geomagnetic field activity was quiet on 27 Oct and 01 Nov, and
reached active levels on 28-31 Oct and 02 Nov. Five synoptic periods
of minor storming (G1) levels were observed on 30-31 Oct due to the
solar wind maximum disturbances caused by the high speed stream
(HSS) associated to a positive coronal hole that dominated the
geospace during the period.



Forecast of Solar and Geomagnetic Activity
03 November - 29 November 2025

Solar activity is expected to be at moderate levels on 03-17 Nov due
to the delayed return of Regions 4246 and 4248, that seem to be
rotating into the Earthside solar disk between 03-04 Nov. At least
two other regions are expected to emerge from the East limb until 10
Nov, as observed at GONG farside images. Solar activity could remain
at moderate levels through 29 Nov if these regions have significant
magnetic complexity.

No proton events are expected at geosynchronous orbit. However, if
the upcoming returning Regions 4246 and 4248 continue to be
magnetically complex with enhanced activity, an isolated proton
event is possible between 07-12 Nov.

The greater than 2 MeV electron flux at geosynchronous orbit is
expected to remain at high levels until 13 Nov, due to the
persistent perturbations at Earth's magnetosphere associated to
the CH HSS. Moderate levels are expected on 14-26 Nov period, and
high levels are expected to return on 27 Nov.

Geomagnetic field activity is expected to be mostly quiet to active
during the 27-day period, with minor storming (G1) levels likely on
07-08, 15 and 26-27 Nov due to recurrence of CH HSS influences.


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