• Weekly Highlights of Solar and Geomagnetic Activity, 02 - 08 August 202

    From SWPC.Webmaster@noaa.gov@21:1/5 to All on Mon Aug 9 13:00:34 2021
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    :Product: Weekly Highlights and Forecasts
    :Issued: 2021 Aug 09 0352 UTC
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    # Weekly Highlights and Forecasts
    Highlights of Solar and Geomagnetic Activity
    02 - 08 August 2021

    Solar activity was at very low levels. An isolated C1 flare peaked
    at 09/0004 UTC just after the reporting period from new Region 2853
    (N23, L=192, class/area Axx/010 on 08 Aug). The single spot just
    appeared late on 08 Aug but was preceded by an area of active plage
    which rotated onto the visible disk on 06 Aug. No Earth-directed
    CMEs were observed.

    No proton events were observed at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit reached
    high levels on 04-05 Aug with a peak flux of 1,570 pfu observed at
    05/1725 UTC.

    Geomagnetic field activity ranged from quiet to G1 (Minor)
    geomagnetic storming. An enhancement in the IMF field began at
    02/0900 UTC, likely from a glancing blow from the 28 Jul CME. Total
    field reached a peak of 13 nT at 02/1810 UTC, while the Bz component
    was mostly negative for 1.5 days reaching -13 nT briefly 02/1815
    UTC. Solar wind speed at this time was between 300-400 km/s. The
    geomagnetic field responded with quiet to G1 storm levels on 02 Aug
    and quiet to active levels on 03 Aug. Quiet conditions were observed
    on 04 Aug through late on 06 Aug. By the middle of 06 Aug, a likely
    CIR preceding a weak positive polarity coronal hole high speed
    stream (CH HSS) was observed causing total field to increase to a
    maximum of 13 nT at 07/0620 UTC along with a prolonged period of
    southward Bz to -9 nT. Solar wind speed briefly increased to near
    475 km/s on 07 Aug before declining to below 400 km/s by midday on
    08 Aug. The geomagnetic field reached unsettled periods late on 06
    Aug through 07 Aug followed by quiet levels on 08 Aug.

    Forecast of Solar and Geomagnetic Activity
    09 August - 04 September 2021

    Solar activity is expected to be at very low levels with a chance
    for further C-class flares through 19 Aug if Region 2853 continues
    to develop and show activity.

    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.

    Geomagnetic field activity is expected to reach unsettled levels on
    09-10 Aug, 16-18 Aug, 23-25 Aug, and 02-04 Sep and reach active
    levels on 24 Aug and 03 Sep due to CH HSS activity.

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