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  • Weekly Highlights of Solar and Geomagnetic Activity, 14 - 20 September

    From SWPC.Webmaster@3:633/10 to All on Mon Sep 21 13:00:05 2026
    Subject: Weekly Highlights of Solar and Geomagnetic Activity, 14 - 20 September 2026

    :Product: Weekly Highlights and Forecasts
    :Issued: 2026 Sep 21 0317 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
    14 - 20 September 2026

    Solar activity was at very low levels on 14-18 Sep and increased to
    low levels on 19-20 Sep. Region 4535 (N12, L=353, class/area Hrx/020
    on 20 Sep) produced a C1.1 flare at 20/0518 UTC, while Region 4534
    (N11, L=074, class/area Dro/030 on 20 Sep) produced a C3.7/1f flare
    at 20/2234 UTC, the largest of the period. No Earth-directed CMEs
    were detected during the highlight period.

    No proton events were observed at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit was at
    high levels on 14 Sep when a maximum flux of 4,650 pfu was observed
    at 14/1315 UTC. Low to moderate levels were observed on 15-20 Sep.

    Geomagnetic field activity reached unsettled levels on 14-17 Sep,
    with isolated active levels observed on 14 and 16 Sep. Unsettled to
    active levels were observed on 14 Sep due to a southern hemisphere
    filament eruption coupled with a SSBC. Unsettled levels were
    observed on 15-17 Sep, with an isolated active period early on 16
    Sep, all due to negative polarity CH HSS effects. Quiet to isolated
    unsettled levels were observed on 18-20 Sep.

    Forecast of Solar and Geomagnetic Activity
    21 September - 17 October 2026

    Solar activity is expected to be <span style="color: rgb(0, 0, 0);
    white-space: pre-wrap;">at low levels, with a slight chance
    </span><span style="color: rgb(0, 0, 0); white-space: pre-wrap;">for
    moderate to high levels throughout the forecast period. </span>

    <span style="color: rgb(0, 0, 0); white-space: pre-wrap;">No proton
    events are expected at geosynchronous orbit.</span>

    The greater than 2 MeV electron flux at geosynchronous orbit is
    expected to be at high levels on 26-30 Sep, 01-03 Oct, and 05-11
    Oct. Low to moderate levels are expected on 21-25 Sep, 04 Oct, and
    12-17 Oct.

    Geomagnetic field activity is expected to <span style="color: rgb(0,
    0, 0); white-space: pre-wrap;">reach active to G1 </span><span
    style="color: rgb(0, 0, 0); white-space: pre-wrap;">storm levels on
    24-25 Sep due to positive polarity CH HSS effects. Unsettled to
    active levels are expected on 26-27 Sep and 04-08 Oct due to
    positive polarity CH HSS effects. Quiet to unsettled levels are
    expected on 11-14 Oct due to negative polarity CH HSS effects.
    Largely quiet levels are anticipated for all remaining dates in the
    forecast period.</span>



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