1. Forum
  2. Fidonet
  3. REC.RADIO.AMATEUR.DX

  • Weekly Highlights of Solar and Geomagnetic Activity, 21 - 27 July 2025

    From SWPC.Webmaster@noaa.gov@3:633/280.2 to All on Tue Jul 29 03:00:05 2025
    Subject: Weekly Highlights of Solar and Geomagnetic Activity, 21 - 27 July 2025

    :Product: Weekly Highlights and Forecasts
    :Issued: 2025 Jul 28 0129 UTC
    # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
    # Product description and SWPC contact on the Web
    # https://www.swpc.noaa.gov/content/subscription-services
    #
    # Weekly Highlights and Forecasts
    #
    Highlights of Solar and Geomagnetic Activity
    21 - 27 July 2025

    Solar activity was at low levels. The largest flare was a C8.1/Sf at
    24/0545 UTC from an unnumbered region located behind the west limb.
    Region 4149 (N17, L=247, class/area Eko/280 on 25 Jul) produced a
    C7.4/Sf at 25/0101 UTC. Several C-class flares were also observed
    from several other regions during the highlight period. No
    Earth-directed CME activity was observed.

    No proton events were observed at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit was at
    high levels on 21-22 July and 24-27 July with a normal to moderate
    period on 23 July. The maximum flux was 13,000 pfu observed at
    21/1700 UTC.

    Geomagnetic field activity reached G1 (Minor) storm levels on 22 and
    23 July due to negative polarity CH HSS influence. Solar wind speeds
    were elevated to as high as 737 km/s late on 23 July. The remaining
    days were quiet to active levels due to weak negative polarity CH
    HSS influence.

    Forecast of Solar and Geomagnetic Activity
    28 July - 23 August 2025

    Solar activity is expected to be at mostly low levels with a chance
    for M-class (R1-R2, Minor to Moderate) flares for the outlook
    period.

    No proton events are expected at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit is
    expected to be at high levels on 28 July, 05-06 August and 10-23
    August all due to recurrent CH HSS influences. Low to moderate
    levels are expected on the remaining days.

    Geomagnetic field activity is expected to be at active to G1 (Minor)
    storm levels on 04 August, 07-14 August and 18-22 August due to
    recurrent CH HSS effects. Quiet to unsettled levels are expected on
    the remaining days of the outlook period.


    --- MBSE BBS v1.1.1 (Linux-x86_64)
    * Origin: NOAA Space Weather Prediction Center (3:633/280.2@fidonet)