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  • Weekly Highlights of Solar and Geomagnetic Activity, 12 - 18 October 20

    From SWPC.Webmaster@3:633/10 to All on Mon Oct 19 13:00:04 2026
    Subject: Weekly Highlights of Solar and Geomagnetic Activity, 12 - 18 October 2026

    :Product: Weekly Highlights and Forecasts
    :Issued: 2026 Oct 19 0141 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
    12 - 18 October 2026

    Solar activity reached moderate levels on 16 Oct when Region 4551
    (S15, L=102, class/area=Eki/620 on 15 Oct) produced an M1.3 flare
    (R1-Minor) at 16/1542 UTC, the largest flare of the week. Solar
    activity was at low levels with C-class flare activity throughout
    the remainder of the period. No Earth-directed CMEs were observed.

    No proton events were observed at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit reached
    high levels on 16 Oct, with normal to moderate levels observed
    throughout the remainder of the week.

    The geomagnetic field was at quiet to unsettled levels on 12-15 and
    17 Oct, with active levels observed on 16 Oct, due primarily to
    negative polarity CH HSS influences. Quiet conditions were observed
    on 18 Oct.

    Forecast of Solar and Geomagnetic Activity
    19 October - 14 November 2026

    Solar activity is expected to predominately low with M-class flare probabilities ranging between a slight chance to a chance 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 23-27 Oct and 01-04 Nov, with
    normal to moderate levels likely the prevail throughout the
    remainder of the period.

    Geomagnetic field activity is likely to reach G1 (Minor) storm
    levels on 19-20 Oct and 31 Oct-01 Nov, with active conditions likely
    on 21 and 24 Oct and 09 Nov, due to CH HSS influences. Quiet and
    quiet to unsettled levels are expected to prevail throughout the
    remainder of the outlook period.


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