:Product: Weekly Highlights and Forecasts :Issued: 2025 Oct 27 0243 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # Product description and SWPC contact on the Web # https://www.swpc.noaa.gov/content/subscription-services # # Weekly Highlights and Forecasts # Highlights of Solar and Geomagnetic Activity 20 - 26 October 2025 Solar activity was at moderate levels on 20 Oct with a single M-class flare observed. Region 4248 (N07, L=262, class/area=Eki/380 on 17 Oct) produced an M1.1 flare, the largest of the period, at 20/0527 UTC. Region 4262 (S12, L=132, class/area=Cai/150 on 22 Oct) produced a pair of long duration C-class flares. The first was a C4.7 that peaked at 22/0152 UTC, with the second being a C2.7 flare at 22/0909 UTC. Additionally, there were two far sided CMEs, likely originating from old Region 4246 (N24, L=290, class/area=Ekc/840 on 16 Oct). These events were observed in LASCO coronagraph imagery on 21/2024 UTC. Additionally, Type II (est. 2474 km/s) and Type IV radio sweeps were observed at 21/2011 UTC, likely associated with the far-sided events as well. There was also a weak CME observed in LASCO imagery on 23/1545 UTC, likely associated with a C2.1 flare at 23/1506 UTC from Region 4256 (S15, L=155, class/area=140/Dao on 18 Oct. This CME is expected to arrive at Earth on 27 Oct. Activity was at low levels from 21-26 Oct. No proton events were observed at geosynchronous orbit. However, the 10 MeV proton flux levels were slightly elevated on 22-23 Oct following the far-sided CME eruptions. Conditions were at background levels on 20-21 Oct and 24-26 Oct. The greater than 2 MeV electron flux at geosynchronous orbit was at normal to moderate levels from 20-26 Oct. Geomagnetic field activity was at mostly quiet to unsettled levels from 20-26 Oct, with the exception of an isolated active period on 25 Oct, likely associated with residual CH HSS influence. Forecast of Solar and Geomagnetic Activity 27 October - 22 November 2025 Solar activity is expected to be at moderate levels on 31 Oct - 15 Nov due to the return of Region 4246. Low levels are expected to prevail on 20 Oct - 30 Oct and 14 Nov - 22 Nov as multiple regions depart the visible disk. No proton events are expected at geosynchronous orbit from 27 Oct - 22 Nov. However, depending on the complexity of returning Region 4246, an isolated proton event is possible. The greater than 2 MeV electron flux at geosynchronous orbit is expected to be at high levels from 31 Oct - 15 Nov due to responses from recurrent CH HSS influences. Moderate levels are expected on 27 - 30 Oct and 16 Nov - 22 Nov. Geomagnetic field activity is expected to be at quiet to unsettled levels on 01 Nov - 06 Nov, 10 Nov - 14 Nov, and 16 Nov - 22 Nov. Active conditions are expected on 27 Oct and 31 Oct, 07 Nov - 09 Nov, and 15 Nov, with G1/G2 conditions likely on 28 Oct - 30 Oct due to recurrent positive polarity CH HSS influence, mixed with possible weak influence from the CME that left the Sun on 23 Oct.