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  • Weekly Highlights of Solar and Geomagnetic Activity, 16 - 22 June 2025

    From SWPC.Webmaster@noaa.gov@3:633/280.2 to All on Tue Jun 24 03:00:05 2025
    Subject: Weekly Highlights of Solar and Geomagnetic Activity, 16 - 22 June 2025

    :Product: Weekly Highlights and Forecasts
    :Issued: 2025 Jun 23 0047 UTC
    # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
    # Product description and SWPC contact on the Web
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    # Weekly Highlights and Forecasts
    #
    Highlights of Solar and Geomagnetic Activity
    16 - 22 June 2025

    Solar activity reached high levels on 17 and 19 Jun when Region 4114
    (N21, L=35, class/area=Ekc/400 on 19 Jun), the largest and most
    complex region on the disk throughout the week, produced an X1.2/2b
    flare at 17/2149 UTC and an X1.9 flare at 19/2350 UTC; the strongest
    events observed this period. In addition, Region 4114 produced five
    R1 (Minor) events on 16-17 and 20 Jun, and one R2 (Moderate) event
    on 16 Jun. Region 4117 (S14, L=303, class/area=210 on 19 Jun)
    produced a single R1 (Minor) event this period; an M1.0/1f flare at
    20/1740 UTC. No Earth-directed CMEs were observed throughout the
    week.

    No proton events were observed at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit was at
    normal to moderate levels throughout the period.

    Geomagnetic field activity was at quiet to active levels on 16,
    18-19, and 21-22 Jun, with quiet to unsettled levels observed on 17
    and 20 Jun, due to sustained positive polarity CH HSS influences
    throughout the week. No Earth-directed CMEs were detected in solar
    wind data.

    Forecast of Solar and Geomagnetic Activity
    23 June - 19 July 2025

    Solar activity is expected to range from low to moderate levels
    throughout the period. There is a chance for R1-R2 (Minor-Moderate)
    radio blackouts, and a slight chance for R3 (Strong) or greater
    events, through 18 Jul.

    No proton events are expected at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit is
    likely to reach high levels on 26-28 Jun, with normal to moderate
    levels likely to prevail throughout the remainder of the period.

    Geomagnetic field activity is likely to reach G1 (Minor) storm
    levels on 25-26 Jun, and active levels on 24 and 27 Jun and 01-03,
    05-06, and 11-12 Jul, all due to recurrent CH HSS influences. Quiet
    and quiet to unsettled conditions are expected to prevail throughout
    the remainder of the period.


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