☀ Helios Solar Watch · 2026-09-21 04:00 UTC
QUIET
The Sun is currently in a state of quiet stability with no significant geomagnetic activity detected. Solar flare production is limited to minor C-class events, posing no immediate threat to terrestrial infrastructure.
Visible light · 4 active regions
Extreme UV · 304 Å
Kp Index
1.7
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 at Kp 1-2 levels throughout the next 24 hours. No significant space weather events or radiation storms are anticipated during this period.
🌌 Aurora
Aurora visibility is restricted to high-latitude regions, generally above 60 degrees.
more
Mid-latitude observers should not expect any auroral activity under these quiet conditions.
👁 Watch for
Monitor the development of AR4535 as it rotates into a more central position, as it remains the most likely candidate for potential M-class flare activity.
▸ Detailed readings
Radio blackout
R0
(24 h max R0)
R0
(24 h max R0)
Radiation
S0
(24 h max S0)
S0
(24 h max S0)
F10.7
95.0
sfu
95.0
sfu
| Region | Location | Class | Flares C/M/X |
|---|---|---|---|
| AR4533 | S14E64 | Hsx/A | 0/0/0 |
| AR4532 | S06W54 | Bxo/B | 0/0/0 |
| AR4534 | N11W08 | Dro/B | 1/0/0 |
| AR4535 | N12E73 | Hrx/A | 1/0/0 |
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