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  • Weekly Highlights of Solar and Geomagnetic Activity, 10 - 16 August 202

    From SWPC.Webmaster@3:633/10 to All on Mon Aug 17 13:00:05 2026
    Subject: Weekly Highlights of Solar and Geomagnetic Activity, 10 - 16 August 2026

    :Product: Weekly Highlights and Forecasts
    :Issued: 2026 Aug 17 0058 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
    10 - 16 August 2026

    Solar activity ranged from very low to low levels throughout the
    period. No R1 (Minor) or greater events were observed. The largest
    flare was a C8.2/Sn at 16/1928 UTC from Region 4506 (N12, L=215, class/area=Dao/100 on 16 Aug). An associated CME was observed in
    LASCO C2 imagery following the C8.2 flare, but analysis is ongoing
    in order to determine any Earth-directed component. Other activity
    included the lift-off of avlarge filament near S16E22 at 14/0332 UTC
    which produced a CME that is expected to arrive on 17-18 Aug.

    No proton events were observed at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit was
    normal to moderate levels throughout the period.

    Geomagnetic field activity was at quiet or quiet to unsettled levels
    throughout the period.

    Forecast of Solar and Geomagnetic Activity
    17 August - 12 September 2026

    Solar activity is expected to range from very low to low levels
    throughout the outlook period, with a slight chance for an R1-R2 (Minor-Moderate) event.

    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 19-20, 23-24, and 28 Aug. Normal to
    moderate levels are expected to prevail throughout the remainder of
    the outlook period.

    Geomagnetic field activity is expected to reach active levels on
    17-18 Aug due to the anticipated arrival of a CME that left the Sun
    on 14 Aug. Active conditions are expected again on 21-22 Aug and 04
    Sep due to the influences of a CH HSS. Quiet and quiet to unsettled
    conditions are expected to prevail throughout the remainder of the
    outlook period.


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