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  • Weekly Highlights of Solar and Geomagnetic Activity, 11 - 17 August 202

    From SWPC.Webmaster@noaa.gov@3:633/280.2 to All on Tue Aug 19 03:00:04 2025
    Subject: Weekly Highlights of Solar and Geomagnetic Activity, 11 - 17 August 2025

    :Product: Weekly Highlights and Forecasts
    :Issued: 2025 Aug 18 0120 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
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    # Weekly Highlights and Forecasts
    #
    Highlights of Solar and Geomagnetic Activity
    11 - 17 August 2025

    Solar activity reached moderate levels on 11-12 Aug due to M-class
    (R1-Minor) flare activity observed. Region 4173 (S18, L=110,
    class/area=Dro/20 on 10 Aug) produced an M1.3 flare at 11/0352 UTC,
    while Region 4168 (N05, L=103, class/area=Eki/350 on 08 Aug)
    produced M1 flares at 11/1435, 11/1536, 12/0059, and 12/0123 UTC.
    Low levels of solar activity were observed over 13-17 Aug. No
    Earth-directed CMEs resulted from the activity observed over the
    past week.

    No proton events were observed at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit reached
    high levels on 11-17 Aug.

    Geomagnetic field activity reached active levels on 11-13 Aug, with
    quiet to unsettled levels observed on 14-15 Aug, due to positive
    polarity CH HSS influence. Quiet conditions prevailed over 16-17 Aug
    with the return of nominal solar wind conditions.

    Forecast of Solar and Geomagnetic Activity
    18 August - 13 September 2025

    Solar activity is expected to be at low levels, with a varying
    chance for M-class flares (R1-R2/Minor-Moderate events), through 13
    Sep.

    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 21-22, 27-28 Aug, and 04-13 Sep.

    Geomagnetic field activity is likely to reach G1 (Minor) storm
    levels on 19 Aug, and active levels on 20 Aug, due to negative
    polarity CH HSS influence. Active conditions are likely again on 28
    Aug due to negative polarity CH HSS influence. Periods of G1-G2 (Minor-Moderate) storming are likely on 05 Sep, with active
    conditions likely on 04 and 06 Sep, due to positive polarity CH HSS
    influence. The remainder of the period is expected to be at quiet or
    quiet to unsettled levels.


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    * Origin: NOAA Space Weather Prediction Center (3:633/280.2@fidonet)