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  • Weekly Highlights of Solar and Geomagnetic Activity, 15 - 21 September 2025

    From SWPC.Webmaster@SWPC.Webmaster@noaa.gov to rec.radio.amateur.dx,rec.radio.amateur.space,rec.radio.shortwave,rec.radio.info on Mon Sep 22 13:00:06 2025
    From Newsgroup: rec.radio.amateur.space

    :Product: Weekly Highlights and Forecasts
    :Issued: 2025 Sep 22 0241 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
    15 - 21 September 2025

    Solar activity reached R1 (Minor) levels at 19/2141 UTC due to an
    impulsive M1.5/3n flare observed from Region 4216 (N10, L=246,
    class/area Dai/210). Low activity levels were observed on 15-18 Sep
    and 20-21 Sep. No significant CME activity was observed.

    No proton events were observed at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit was at
    high levels from 16-21 Sep with a maximum flux of 6,210 pfu observed
    at 18/1655 UTC. Normal to moderate levels were observed on 15 Sep.

    Geomagnetic field activity was at G1 (minor) levels on 15-16 Sep and
    at G3 (Strong) levels on 15 Sep due to CIR/ negative polarity CH HSS
    onset with possible influence from the 11 Sep CME. Quiet to
    unsettled levels were observed on 17 Sep as the negative polarity CH
    HSS waned. Quiet levels were observed on 18-21 Sep.

    Forecast of Solar and Geomagnetic Activity
    22 September - 18 October 2025

    Solar activity is expected to be at low levels with a chance for
    isolated M-class flares 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 be at high levels on 22-24 Sep, 30 Sep and 01 Oct, 06
    -11 Oct and 13-18 Oct. Normal to moderate levels are expected for
    the remainder of the outlook period.

    Geomagnetic field activity is expected to be at G1 (Minor) storm
    levels on 22 Sep due to influences from a negative polarity CH HSS.
    Unsettled to active levels are likely on 23 Sep. Unsettled to active
    levels are likely on 29-30 Sep, 03-07 Oct, 11-13 Oct and 18 Oct due
    to recurrent CH HSS influences. Quiet to unsettled levels are likely
    for the remaining days in the outlook period.

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