Latest Helios Report

  • Solar Watch — August 21, 2026 | 18:00 UTC

    ☀ Helios Solar Watch · 2026-08-21 16:00 UTC
    QUIET

    Solar activity remains in an unsettled state characterized by frequent M-class flaring despite low current geomagnetic indices. Seven active regions are currently identified on the solar disk, with AR4513 showing notable complexity.

    ⚡ Flare activity — last 12 h
    Peak: M @ 10:18 UTC (5h 42min ago) · M @ 09:35 UTC · M @ 10:06 UTC · M @ 10:37 UTC · M @ 11:08 UTC
    HMI Continuum Intensity

    Visible light · 4 active regions

    SUVI 304 — Extreme UV

    Extreme UV · 304 Å

    Kp Index
    2.0
    5 or above = storm

    Geomagnetic
    G0
    24 h max: G0

    X-Ray
    A/B
    quiet


    ⚠ Electron flux F3 reached · 4 more below
    Next 24 h

    Geomagnetic activity is expected to remain largely quiet, with a brief uptick to Kp 3.67 anticipated late on August 21st. Flare probability remains elevated for the next 24 hours, with a 55% chance of further M-class activity.

    🌌 Aurora

    Aurora visibility is not expected for mid-latitudes at this time.

    more

    Observers at very high latitudes may see minor activity if the forecast Kp 3 peak materializes, but no significant displays are anticipated.

    👁 Watch for

    Monitor the evolution of active region AR4513 as it rotates across the solar disk, as its current classification suggests potential for further eruptive activity.

    ▸ Detailed readings

    Radio blackout
     R0
    (24 h max R0)
    Radiation
     S0
    (24 h max S0)
    F10.7
     111.0
    sfu

    Region Location Class Flares C/M/X
    AR4513 N04E55 Eac/BGD 4/0/0
    AR4514 S10W70 Cro/B 1/0/0
    AR4515 S08E63 Hrx/A 0/0/0
    AR4508 N09W64 Hrx/A 0/0/0
    NOAA messages
    2026-08-21 11:18  Electron flux F3 reached (ALTEF3)
    2026-08-21 09:45  SUM10R (SUM10R)
    2026-08-20 20:49  ALTTP2 (ALTTP2)
    2026-08-20 12:12  X-ray flare M5 summary (SUMXM5)
    2026-08-20 11:39  X-ray flare MF reached (ALTXMF)


    Helios Observer · Data: NOAA SWPC · updated every 12 h