• Weekly Highlights of Solar and Geomagnetic Activity, 22 - 28 April 2024

    From SWPC.Webmaster@noaa.gov@21:1/5 to All on Mon Apr 29 13:00:07 2024
    XPost: rec.radio.amateur.space, rec.radio.shortwave, rec.radio.info

    :Product: Weekly Highlights and Forecasts
    :Issued: 2024 Apr 29 0236 UTC
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    # Weekly Highlights and Forecasts
    Highlights of Solar and Geomagnetic Activity
    22 - 28 April 2024

    Solar activity reached high levels on 22 Apr and 24 Apr. Moderate
    levels were observed on 23 Apr, 25 Apr, and 27 Apr. Finally, low
    levels were observed on 26 Apr and 28 Apr. In total, there were 20
    low-level M-class events (R1-Minor) over the past week. The
    strongest was an M3.6 flare at 23/0319 UTC from Region 3654 (S07,
    L=135, class/area=Ekc/310 on 28 Apr). Of the 24 numbered active
    regions observed on the visible disk, 6 produced M-class activity.

    Type II radio events were observed on the 22 Apr, 23 Apr, and 24
    Apr. The 23 Apr event was associated with an M2.9 flare at 23/1744
    UTC from Region 3645 (S09, L=226, class/area=Dki/290 on 21 Apr). The
    24 Apr event was associated with a C9.4 flare at 24/1410 UTC from
    Region 3638 (S18, L=227, class/area=Cri/080 on 21 Apr) and was also
    accompanied by a Type IV radio sweep. The associated CMEs are likely
    to have been associated with geomagnetic activity observed at Earth
    over 26 Apr. The region produced numerous, small, slow-moving CMEs
    that were primarily directed south of the ecliptic plane over the

    An additional CME first observed ~27/1100 UTC in SOHO/LASCO C2
    imagery, which originated from the vicinity of Region 3654, was
    analyzed and modeled. The results suggested a component along the
    Sun-Earth line with effects likely to be observed around 01 May.

    No proton events were observed at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit reached
    high levels on 25 Apr. The remainder of the summary was at normal to
    moderate levels.

    Geomagnetic field activity was ranged from quiet to G1 (Minor)
    geomagnetic storm levels. G1 levels observed on 26 Apr are thought
    to be associated with transient influence from activity that
    occurred on the Sun several days earlier. Unsettled conditions on 27
    Apr were observed the Bz component of the IMF turned northward.
    Active conditions were reached early on 28 Apr due to a positive
    polarity CH HSS. The remainder of the summary period was at quiet to
    unsettled levels.

    Forecast of Solar and Geomagnetic Activity
    29 April - 25 May 2024

    Solar activity is expected to be at low levels with a chance for
    M-class (R1-R2/Minor-Moderate) activity over the outlook period.
    Primarily contributors to flare probability include Region 3654
    currently in the western hemisphere and a collective of active and
    adjacent regions in the southern hemisphere which are due to return
    to the visible disk over 08-10 May.

    No proton events are expected at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit is
    expected to be normal to moderate levels over the outlook period.

    Geomagnetic field activity is expected to range from quiet to active
    levels. Active levels on the 01-02 May are anticipated due to likely
    influence from combined effects of a CH HSS and transient effects of
    a CME that left the Sun on 27 Apr. Active levels on 23-24 May and
    unsettled levels on 29-30 Apr and 03-07 May are expected due to
    recurrent CH HSS features. The remainder of the outlook period is
    likely to be at mostly quiet levels.

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