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Solar flares — September 21, 2025

Home Solar flares September 21, 2025

The strongest solar flare in the day

Flare of C3.4 level (normal) — in 01:41

Solar activity index

Value for Sep 21, 2025 24:00 (end on the day) . The maximum value is 10.0

Solar activity index

Solar flares in 2 days

Chart of solar activity from Sep 20, 2025 to Sep 21, 2025

Time zone — UTC+05:30 (Tiruvottiyur)

Solar flares
This chart in PNG format — high resolution API data: JSON or TXT

List of solar flares for Sep 21, 2025

Total number of flares of class C and higher – 10 flares

C type — 10 | M type — 0 | X type — 0

  start maximum end region
C3.3
23:03 23:13 23:20 4224
C2.3
22:31 22:38 22:44 4220
C2.1
20:12 20:15 20:19 4217
C1.6
17:25 17:33 17:50 4228
C1.6
15:23 15:31 15:36 4217
C1.7
12:47 12:57 13:10
C2.1
12:03 12:17 12:38 4220
C2.8
10:57 11:03 11:19 4220
C2.4
10:07 10:37 11:15 4217
C3.4
01:27 01:41 02:04 4220