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  • Weekly Highlights of Solar and Geomagnetic Activity, 06 - 12 December 2

    From SWPC.Webmaster@noaa.gov@21:1/5 to All on Mon Dec 13 13:00:10 2021
    XPost: rec.radio.amateur.space, rec.radio.shortwave, rec.radio.info

    :Product: Weekly Highlights and Forecasts
    :Issued: 2021 Dec 13 0138 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
    06 - 12 December 2021

    Solar activity ranged from very low to low. A C1.3 flare was
    observed at 06/0622 UTC from Region 2902 (N18, L=198, class/area
    Dsi/100 on 02 Dec), the largest of the period. All other numbered
    regions on the visible disk were quiescent. No Earth-directed CMEs
    were observed in available coronagraph imagery during the reporting
    period.

    No proton events were observed at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit was
    normal to high levels. High levels were observed from 06-10 Dec
    following influence from a positive polarity CH HSS. Normal to
    moderate levels returned on 11-12 Dec.

    Geomagnetic field activity ranged from quiet to unsettled. Isolated
    unsettled levels were observed on 06-07 Dec in response to influence
    from a positive polarity CH HSS and again on 11 Dec following the
    onset of a weak, slow-moving transient feature. The remainder of the
    summary period was at quiet levels.

    Forecast of Solar and Geomagnetic Activity
    13 December - 08 January 2022

    Solar activity is expected to be at very low levels through the
    outlook period.

    No proton events are expected at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit is
    expected to range from normal to high levels. High levels are likely
    on 16-21 Dec and again on 29 Dec - 04 Jan in response to multiple,
    recurrent CH HSSs. Normal to moderate levels are expected for the
    remainder of the outlook period.

    Geomagnetic field activity is expected to be at quiet to G1 (Minor)
    geomagnetic storm levels. G1 levels are likely on 27-28 Dec; active
    conditions are likely on 15 Dec and 29 Dec; unsettled conditions are
    likely on 13 Dec, 16-18 Dec and 30 Dec - 01 Jan. All elevations in
    geomagnetic activity are anticipated in response to multiple,
    recurrent CH HSSs. The remainder of the outlook period is likely to
    be at quiet levels under nominal solar wind conditions.

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