• Weekly Highlights of Solar and Geomagnetic Activity, 04 - 10 April 2022

    From SWPC.Webmaster@noaa.gov@21:1/5 to All on Mon Apr 11 13:00:13 2022
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    :Product: Weekly Highlights and Forecasts
    :Issued: 2022 Apr 11 1312 UTC
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    # Weekly Highlights and Forecasts
    Highlights of Solar and Geomagnetic Activity
    04 - 10 April 2022

    Solar activity was at low levels through the period with numerous
    C-class flares observed. Rgn 2978 (S19, L=011, class/area Eko/670 on
    30 Mar) produced a majority of the C-class activity with the largest
    event a C4 observed at 10/0241 UTC. Additional C-class activity was
    observed from Rgns 2967 (N20, L=075, class/area Eho/530 on 26 Mar),
    2979 (S22, L=030, class/area Azz/030 on 29 Mar), 2982 (S20, L=334,
    class/area Bxo/040 on 04 Apr), 2983 (N20, L=328, class/area Hsx/040
    on 02 Apr) and 2985 (S20, L=289, class/area Hax/050 on 05 Apr).
    During the period, numerous filament eruptions were observed on 03,
    04 and 07 Apr that impacted Earth on 06-10 Apr. More details below.

    No proton events were observed at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit was at
    high levels on 04-07 Apr with a peak flux of 3,920 pfu observed on
    04 Apr. Low to moderate levels were observed on 08-10 Apr.

    Geomagnetic field activity ranged from quiet to strong (G3) levels
    during the period. Unsettled to active levels were observed on 04
    Apr due to negative polarity CH HSS effects. This was followed by
    quiet levels on 05 Apr. Quiet to unsettled levels occured on 06 Apr
    due to weak effects from the 03 Apr CME. 07 Apr saw quiet to active
    levels due to combined effects from the 03 and 04 CMEs. 08-09 Apr
    witnessed quiet to active levels as effects from the 04 Apr CME
    persisted. On 10 Apr, effects from the 07 CME, combined with
    negative polarity CH HSS influence, increased geomagnetic levels to
    Minor to Strong (G1-G3) storm levels. On the 10th, wind speeds were
    initially in the 450-475 km/s range, became elevated to about 530
    km/s near 10/0400 UTC before settling down to about 485 km/s by the
    end of the day. Density peaked to 36 ppcm at about 10/0215 UTC,
    total field Bt increased to 19 nT and the Bz component dived south
    to -15 nT at 10/0513 UTC. The phi angle switched from a positive
    orientation to a mostly negative sector at 10/0214 UTC.

    Forecast of Solar and Geomagnetic Activity
    11 April - 07 May 2022

    Solar activity is likely to be moderate (R1-R2, Minor-Moderate) on
    15-28 Apr due to the return of old Rgn 2975 (N13, L=088). Very low
    to low activity is expected on 11-14 Apr, 29-30 Apr and 01-07 May.

    No proton events are expected at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit is
    expected to be at normal to moderate levels on 11-29 Apr and 05-07
    May with moderate to high levels on 30 Apr and 01-04 May in response
    to CH HSS influence.

    Geomagnetic field activity is expected to reach unsettled to active
    levels on 11, 14-15, 20-21, 23-24, 29-30 Apr, 01 and 06-07 May, all
    due to recurrent CH HSS effects. Quiet conditions are anticipated
    for the remainder of the outlook period.

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