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  • Weekly Highlights of Solar and Geomagnetic Activity, 24 - 30 November 2

    From SWPC.Webmaster@3:633/10 to All on Mon Dec 1 13:00:04 2025
    Subject: Weekly Highlights of Solar and Geomagnetic Activity, 24 - 30 November 2025

    :Product: Weekly Highlights and Forecasts
    :Issued: 2025 Dec 01 0212 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
    24 - 30 November 2025

    Solar activity was at low levels over 24-27 and 30 Nov with C-class
    flare activity observed. High levels of solar activity were observed
    on 28 Nov when Region 4294 (S15, L=293, class/area=Fkc/1100 on 30
    Nov) produced an impulsive M5.9 flare (R2-Moderate) at 28/2222 UTC,
    with Type-II (828 km/s) and Tenflare (240 sfu) radio emissions, as
    the region rotated onto the disk from the SE limb. Solar activity
    reached high levels again on 29 Nov with six M-class flares
    (R1-Minor) observed from Region 4294. No Earth-directed CMEs were
    detected during the summary period.

    No proton events were observed at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit was a
    normal to moderate levels on 24-27 Nov, with high levels observed on
    28-30 Nov.

    Geomagnetic field activity reached active levels on 24 Nov, and G1
    (Minor) storm levels on 25 Nov, due to negative polarity CH HSS
    influences. Active levels were observed again on 26 Nov as negative
    polarity CH HSS influences subsided, followed by the onset of
    positive polarity CH HSS influences. Periods of G1 (Minor) storming
    were observed on 27 Nov, with periods of active conditions observed
    over 28-30 Nov, due to continued positive polarity CH HSS
    influences.

    Forecast of Solar and Geomagnetic Activity
    01 December - 27 December 2025

    Solar activity is likely to reach moderate to high levels during the
    outlook period. M-class flares (R1-R2/Minor-Moderate) are likely,
    with slight chance for X-flares (R3-Strong or greater), through 12
    Dec due primarily to the flare potential of Region 4294.

    There exists a slight chance for the greater than 10 MeV proton flux
    to reach S1 (Minor) solar radiation storm levels through 12 Dec, due
    primarily to the eruptive potential of Region 4294.

    The greater than 2 MeV electron flux at geosynchronous orbit is
    expected to reach high levels on 01-06, 16-17, and 24-27 Dec. Normal
    to moderate levels are expected to prevail throughout the remainder
    of the outlook period.

    Geomagnetic activity is likely to reach active levels on 03 and 06
    Dec, and G1 (Minor) storm levels on 04-05 Dec, driven by influences
    from a negative polarity CH HSS. Additional G1 storm periods are
    likely on 13 Dec, with active levels likely on 14 Dec, again
    associated with negative polarity CH HSS effects. Active conditions
    are likely on 21 Dec, followed by G1 storm levels on 22 Dec, in
    response to negative polarity CH HSS influences. Further G1 storm
    periods are likely on 23-26 Dec, with active levels likely on 27
    Dec, due to positive polarity CH HSS influences. Quiet and quiet to
    unsettled conditions are expected to prevail throughout the
    remainder of the outlook period.


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