• Weekly Highlights of Solar and Geomagnetic Activity, 20 - 26 December 2

    From SWPC.Webmaster@noaa.gov@21:1/5 to All on Mon Dec 27 13:00:17 2021
    XPost: rec.radio.amateur.space, rec.radio.shortwave, rec.radio.info

    :Product: Weekly Highlights and Forecasts
    :Issued: 2021 Dec 27 0408 UTC
    # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
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    # Weekly Highlights and Forecasts
    Highlights of Solar and Geomagnetic Activity
    20 - 26 December 2021

    Solar activity was at low levels with C-class flare activity on
    23-26 Dec. Moderate levels of solar activity were observed on 20-22
    Dec due to M-class flare activity. Region 2908 (S20, L=300,
    class/area=Dai/100 on 22 Dec) produced M1/1n flares at 20/1136 and
    22/0706 UTC while Region 2916 (S18, L=194, class/area=Ekc/450 on 25
    Dec) produced two M1 flares at 21/0750 and 21/1144 UTC. The
    remainder of the period was dominated by frequent C-class flare
    activity primarily from Regions 2908 and 2916, in addition to
    Regions 2907 (S22, L=313, class/area=Eki/300 on 23 Dec) 2918 (N19,
    L=211, class/area=Dki/280 on 25 Dec).

    No proton events were observed at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit was
    normal to moderate on 20-22 Dec and at high levels on 23-26 Dec
    following CH HSS-associated enhancements.

    Geomagnetic field activity reached active levels on 20-21 Dec and
    unsettled levels on 22 Dec due to the influences of a negative
    polarity CH HSS. Quiet to unsettled levels were observed on 25 Dec
    due to what appeared to be the possible arrival of a CME from 21
    Dec. Quiet field conditions and a nominal solar wind regime
    dominated the remainer of the period.

    Forecast of Solar and Geomagnetic Activity
    27 December - 22 January 2022

    Solar activity is expected to be mostly at very low to low levels,
    with isolated M-class flare activity possible, 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 reach high levels on 27 Dec-03 Jan and 17-22 Jan. Normal
    to moderate levels are expected prevail throughout the remainder of
    the period.

    Geomagnetic field activity is expected to reach active levels on
    25-29 Dec and 16 Jan due to CH HSS influences. Quiet to unsettled or
    generally quiet conditions are expected for the remainder of the

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