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

  • Weekly Highlights of Solar and Geomagnetic Activity, 25 - 31 May 2026

    From SWPC.Webmaster@3:633/10 to All on Mon Jun 1 13:00:06 2026
    :Product: Weekly Highlights and Forecasts
    :Issued: 2026 Jun 01 0157 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
    25 - 31 May 2026

    Solar activity reached moderate levels on 29 May when Region 4455
    (N15, L=83, class/area=Eko/370 on 29 May) produced an M1.1/Sf flare
    at 29/0704 UTC; the largest flare of the period. Solar activiy was
    low with C-flare activity observed throughout the remainder of the
    week.

    The greater than 10 MeV proton flux became enhanced late on 25 May
    following an eruption from beyond the NW limb. The greater than 10
    MeV proton flux exceeded S1 (Minor) levels at 26/0010 UTC, and
    reached a peak flux of 2,380 pfu at 26/0110 UTC before decreasing
    below S1 levels by 26/0540 UTC. The greater than 100 MeV proton flux
    also became enhanced following this event, but did not exceed alert
    threshold.

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

    Geomagnetic field activity reached unsettled levels on 25 and 27
    May, with active levels observed on 26, and 28-31 May, as negative
    polarity CH HSS influences prevailed throughout the period.

    Forecast of Solar and Geomagnetic Activity
    01 June - 27 June 2026

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

    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 12-20 Jun, with normal to moderate
    levels likely throughout the remainder of the period.

    Geomagnetic field activity is likely to reach G2 (Moderate) storm
    levels on 11 Jun, with G1 (Minor) storming likely on 12 Jun, due to
    negative polarity CH HSS influences. Active conditions are likely on
    01, 03-05, 13-14, and 23-27 Jun due to multiple recurrent CH HSSs.
    Quiet and quiet to unsettled conditions are expected to prevail
    throughout the remainder of the outlook period.


    --- PyGate Linux v1.5.15
    * Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)