Solar Watch — April 28, 2026 | 18:00 UTC

Solar Flare Activity — Last 12 Hours
Peak: M-class @ 13:53 UTC (2h 7min ago)
  M @ 12:22 UTC  ·  M @ 13:53 UTC

☀ HELIOS SOLAR WATCH · 2026-04-28 16:00 UTC
Solar activity remains stable; M-class flare potential elevated
SOLAR: UNSETTLED
GEO: QUIET

Active Regions
7
X-Ray
A/B (quiet)

Geomagnetic conditions are currently quiet, but solar flare activity is elevated due to complex magnetic configurations in AR4420. The Sun is exhibiting moderate levels of activity with no immediate terrestrial impact expected.

HMI Continuum Intensity

HMI Continuum · Visible Light

SUVI 304 — Extreme UV

SUVI 304Å · Extreme Ultraviolet

R0
Radio Blackouts
24h max: R0

S0
Solar Radiation
24h max: S0

G0
Geomagnetic Storm
24h max: G0

Planetary Kp-Index
1.3
0–9 scale · ≥5 = geomagnetic storm

F10.7 Solar Flux
113.0
sfu · >150 = high activity

The planetary K-index is at a low 1.3, indicating a very stable magnetosphere. Solar activity is being driven by AR4420, which has produced three M-class flares in the last 12 hours. With an F10.7 flux of 113 sfu, the solar environment remains at moderate levels of activity.

Key Metric

The 55% probability of M-class flares is the primary metric, as it highlights the ongoing instability of AR4420 which could disrupt HF radio communications on the sunlit side of Earth if a larger flare occurs.

Geomagnetic conditions will remain quiet, with Kp values expected to hover between 1.67 and 2.0. Solar flare activity is likely to continue at moderate levels, with a 55% probability of further M-class events occurring within the next 24 hours.

🌌 Aurora Outlook

No significant aurora activity is expected at mid-latitudes. The current solar wind parameters are insufficient to drive widespread auroral displays beyond the standard polar regions.

Region Location Class Flares C/M/X
AR4424 N16W08 Dso/B 1/0/0
AR4420 N16W43 Fkc/BGD 7/3/0
AR4423 S05W24 Axx/A 0/0/0
AR4421 S12W31 Hax/A 0/0/0
AR4425 N05E22 Ekc/BGD 2/0/0
AR4427 S31E26 Axx/A 0/0/0
AR4428 S23E12 Cso/B 0/0/0
2026-04-27 01:06:25.970Space Weather Message Code: ALTTP2
2026-04-26 23:33:07.687Space Weather Message Code: WARK04
2026-04-26 23:17:50.840Space Weather Message Code: SUMXM5
2026-04-26 23:08:38.813Space Weather Message Code: SUM10R
2026-04-26 23:00:55.950Space Weather Message Code: ALTXMF

Monitor AR4420 for further magnetic complexity or sudden structural changes that might signal an X-class flare potential.