Solar Watch — September 18, 2026 | 18:00 UTC

☀ Helios Solar Watch · 2026-09-18 16:00 UTC
QUIET

Solar activity is currently stable and quiet, with geomagnetic conditions well below storm thresholds. Three active regions are present on the solar disk, but flare production remains minimal.

HMI Continuum Intensity

Visible light · 0 active regions

SUVI 304 — Extreme UV

Extreme UV · 304 Å

Kp Index
0.7
5 or above = storm

Geomagnetic
G0
24 h max: G0

X-Ray
A/B
quiet


⚠ Kp 4 expected · 4 more below
Next 24 h

Geomagnetic conditions are expected to remain quiet for the next 24 hours, with a slight, temporary increase to Kp 3 possible around 21:00 UTC today.

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No significant radio blackouts or solar radiation storms are anticipated given the current solar flux environment.

🌌 Aurora

Aurora visibility for mid-latitudes (40-60°N) is currently non-existent, as the geomagnetic field is not sufficiently disturbed to drive particle precipitation to lower latitudes.

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Observers should not expect any activity tonight.

👁 Watch for

Monitor the evolution of the three currently visible active regions for any signs of magnetic complexity that could lead to an unexpected M-class solar flare.

▸ Detailed readings

Radio blackout
 R0
(24 h max R0)
Radiation
 S0
(24 h max S0)
F10.7
 94.0
sfu

NOAA messages
2026-09-16 05:38  Kp 4 expected (WARK04)
2026-09-16 00:34  Kp 4 reached (ALTK04)
2026-09-15 18:56  Kp 5 (G1) expected (WARK05)
2026-09-15 17:37  Kp 20 possible (WATA20)
2026-09-14 11:03  Electron flux F3 reached (ALTEF3)


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