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Solar flares — October 21, 2025

October 21, 2025

Today

UTC+00
Home Solar flares October 21, 2025

Solar flares on October 21, 2025

The most powerful solar flare in 24 hours

C3.7 (normal) flare - October 21 at 6:49 AM

Solar activity index

Value as of the end of the day on October 21, 2025

Solar activity index

Solar X-ray emission over the past 2 days

Chart of solar X-ray emission (1-8 Å) from October 20, 2025 to October 21, 2025

Time zone — UTC+00

Solar flares
PNG API: JSON | TXT

List of solar flares for October 21, 2025

The total number of solar flares of class C and higher — 3 flares

C class — 3 | M class — 0 | X class — 0

Class begin max end region
C1.5 23:36 23:47 23:53
C3.7 06:36 06:49 06:59
C1.3 05:54 06:00 06:05 4248