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

  • Weekly Highlights of Solar and Geomagnetic Activity, 17 - 23 November 2

    From SWPC.Webmaster@3:633/10 to All on Mon Nov 24 13:00:04 2025
    Subject: Weekly Highlights of Solar and Geomagnetic Activity, 17 - 23 November 2025

    :Product: Weekly Highlights and Forecasts
    :Issued: 2025 Nov 24 0142 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
    17 - 23 November 2025

    Solar activity was at low levels. C-class activity was observed from
    Regions 4274 (N25, L=274), 4284 (S07, L=177, class/area Dai/150 on
    19 Nov), 4290 (S10, L=035, class/area Cao/120 on 22 Nov) and 4291
    (S14, L=028, class/area Dao,120 on 22 Nov).

    No proton events were observed at geosynchronous orbit.

    The greater than 2 MeV electron flux at geosynchronous orbit reached
    high levels on 19-20 Nov with a peak flux of 2,880 pfu on 20/1435
    UTC. Normal to moderate levels were reached on 17-18 Nov and 21-23
    Nov.

    Geomagnetic field activity was at mostly quiet to unsettled levels
    with isolated active levels observed early on 17 Nov and midday on
    23 Nov. Solar wind parameters were enhanced midday on 20 Nov when Bt
    reached 18 nT and Bz reached values at -10 nT. Solar wind speeds
    began the highlight period at about 550 km/s, declined to near 325
    km/s early on 20 Nov and gradually increased to about 500 km/s late
    on 23 Nov.

    Forecast of Solar and Geomagnetic Activity
    24 November - 20 December 2025

    Solar activity is expected to be expected to be at R1-R2
    (Minor-Moderate) levels on 28-30 Nov and 01-11 Dec, primarily due to
    the flare potential and return of old Region 4274. Mostly C-class
    activity is expected on 24-27 Nov and 12-20 Dec.

    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 28-30 Nov, 01-03 Dec, 08-12 Dec and
    16-17 Dec, all due to coronal hole influence. The remainder of the
    outlook period is likely to be at normal to moderate levels.

    Geomagnetic field activity is expected to range from quiet to G1-G2 (Minor-Moderate) geomagnetic storm levels. G1-G2 (Minor-Moderate)
    levels are likely on 26-27 Nov and 03-04 Dec due to anticipated
    influence from CH HSS. Unsettled to active conditions are likely on
    24-25 Nov, 28-30 Nov, 05-07 Dec, 12-14 Dec and 17-19 Dec. Mostly
    quiet levels are likely on 01-02 Dec, 08-11 Dec, 15-16 Dec and 20
    Dec.


    --- PyGate Linux v1.5.1
    * Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)