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  • Weekly Highlights of Solar and Geomagnetic Activity, 19 - 25 October 20

    From SWPC.Webmaster@3:633/10 to All on Mon Oct 26 13:00:04 2026
    Subject: Weekly Highlights of Solar and Geomagnetic Activity, 19 - 25 October 2026

    :Product: Weekly Highlights and Forecasts
    :Issued: 2026 Oct 26 0118 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
    19 - 25 October 2026

    Solar activity reached moderate levels on 19 Oct when Region 4551
    (S15, L=102, class/area=Eki/620 on 15 Oct) produced an M1.6/1n
    (R1-Minor) flare at 19/0903 UTC; the largest flare of the week.
    Solar activity was at low levels throughout the remainder of the
    week. No Earth-directed CMEs were observed.

    No proton events were observed at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit was at
    normal to moderate levels on 19-22 Oct, with high levels observed on
    23-25 Oct.

    Geomagnetic field activity was quiet on 19 Oct through much of 20
    Oct under background solar wind conditions. Unsettled levels were
    observed late on 20 Oct following the initial onset of positive
    polarity CH HSS influences. G1 (Minor) geomagnetic storming was
    observed on 21 Oct, with active conditions observed on 22-23 Oct,
    due to sustained positive polarity CH HSS influences. Quiet
    conditions were observed on 24-25 Oct with the return of an ambeint
    solar wind environment.

    Forecast of Solar and Geomagnetic Activity
    26 October - 21 November 2026

    Solar activity is expected to be at predominately low levels, with a
    varying chance for M-class (R1-R2/Minor-Moderate) flare activity
    throughout the outlook period.

    No proton events are expected at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit is
    expected to reach high levels on 26-30 Oct, and 03-05 Nov, and 19-21
    Nov. Normal to moderate flux levels are expected for the remainder
    or the outlook period.

    Due to multiple recurrent CH HSSs, geomagnetic field activity is
    likely to reach G1 (Minor) storm levels on 31 Oct, with active
    levels likely on 01, 09, and 17-18 Nov. The remainder of the outlook
    period is expected to be at quiet or quiet to unsettled levels.


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