• Weekly Highlights of Solar and Geomagnetic Activity, 24 - 30 April 2023

    From SWPC.Webmaster@noaa.gov@21:1/5 to All on Mon May 1 13:00:11 2023
    XPost: rec.radio.amateur.space, rec.radio.shortwave, rec.radio.info

    :Product: Weekly Highlights and Forecasts
    :Issued: 2023 May 01 0202 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
    24 - 30 April 2023

    Solar activity was at low to moderate levels during the period. Low
    levels were observed throughout the period from Regions 3282 (N11,
    L=024, class/area Eki/530 on 16 Apr), 3283 (S20, L=356, class/area
    Bxo/050 on 20 Apr), 3285 (S19, L=273, class/area Cao/240 on 27 Apr),
    3288 (S23, L=267, class/area Ehc/420 on 30 Apr), 3289 (N20, L=213,
    class/area Dai/220 on 30 Apr) and 3293 (N13, L=141, class/area
    Cao/030 on 30 Apr).

    Activity reached moderate levels due to an M1.8/Sn flare at 27/1114
    UTC from Region 3288. New Region 3293 produced an M2.4/1f flare at
    30/2028 UTC.

    No proton events were observed at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit reached
    normal to moderate levels on 24-25 April and 30 April. High levels
    were observed on 26-29 April with a high flux reading of 12,967 pfu
    at 29/1645 UTC.

    Geomagnetic field activity ranged from quiet to G4 (Severe) storm
    conditions during the period. The period began with G2 (Moderate),
    G3 (Strong) and G4 (Severe) storm conditions due to response from
    the full-halo CME that left the Sun on 21 Apr. These storm
    conditions were observed midday on 27 April as the CME effects were
    beginning to wane. The later half of 27 April through 28 April
    observed quiet to active levels due to waning CME effects. During
    26-30 April, quiet to active levels were observed due to negative
    polarity CH HSS influence.

    Forecast of Solar and Geomagnetic Activity
    01 May - 27 May 2023

    Solar activity is expected to remain at low levels with a chance for
    M-class (R1-R2, Minor-Moderate) flares on 01-13 May and 17-27 May.

    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 01-06 May, with normal to moderate
    levels on 07-27 May.

    Geomagnetic field activity is expected to be at unsettled to active
    levels on 01-04, 06,07, 11-12 and 23-27 May, with G1 (Minor) storm
    conditions on 24 May, all due to CH HSS effects. Some weak CME
    effects are possible on 02-03 May. Mostly quiet levels are expected
    on 05, 08-10 and 13-22 May.

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