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  • Weekly Highlights of Solar and Geomagnetic Activity, 03 - 09 April 2023

    From SWPC.Webmaster@noaa.gov@3:633/280.2 to All on Tue Apr 11 03:00:10 2023
    Subject: Weekly Highlights of Solar and Geomagnetic Activity, 03 - 09 April 2023

    :Product: Weekly Highlights and Forecasts
    :Issued: 2023 Apr 10 0353 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
    03 - 09 April 2023

    Solar activity was at low to moderate levels. Low levels were
    observed on 03-05, 07, and 09 Apr while moderate levels were
    observed on 06 and 08 Apr. Region 3272 (S21, L=102, class/area
    Eai/280 on 09 Apr) was responsible for the majority of the C-class
    activity since its emergence on 05 Apr. The region also produced M3
    and M2/1n flares at 06/0553 UTC and 08/0146 UTC, respectively. Other
    activity included a CME off the SW limb first observed at 07/1336
    UTC that was associated with a filament eruption seen in SDO/AIA 304
    imagery beginning at 07/0829 UTC centered near S27W10. Modelling
    indicated a miss, however a glancing blow could not be ruled out
    early on 12 Apr.

    No proton events were observed at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit reached
    high levels throughout the period due to CH HSS influence. The
    maximum flux was 4,290 pfu observed at 03/1455 UTC.

    Geomagnetic field activity ranged from quiet to active levels. The
    period began with solar wind speed around 528 km/s with total field
    near 6-7 nT under negative polarity CH HSS influence. By late on 05
    Apr, solar wind speed returned to nominal levels until 09/2158 UTC
    when total field showed a small increase to 8 nT. The geomagnetic
    field responded with quiet to active levels on 03-04 Apr, quiet to
    unsettled levels on 05-07 and 09 Apr, and quiet levels on 08 Apr.

    Forecast of Solar and Geomagnetic Activity
    10 April - 06 May 2023

    Solar activity is expected to be low with a chance for moderate
    levels (R1-R2, Minor-Moderate) on 10-25 Apr and again from 02-06 May
    due to flare potential of Region 3272 and the return of old Region
    3256 (S22, L=001) on 12 Apr. Very low to low levels are expected on
    26 Apr-01 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 10-11 Apr and again on 23 Apr-06
    May due to recurrent CH HSS influence.

    Geomagnetic field activity is expected to reach unsettled levels on
    10-11 Apr due to CH HSS activity. Unsettled to active levels are
    expected on 12 Apr due to a combination of HSS influence and a
    possible glancing blow from the 07 Apr CME. Unsettled to active
    levels are expected again on 17-18 Apr, 20-22 Apr, and 26 Apr-04 May
    with G1 (Minor) storming likely on 20, 27, and 30 Apr due to
    recurrent CH HSS activity.


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    * Origin: NOAA Space Weather Prediction Center (3:633/280.2@fidonet)