Solar flares — Oct 21, 2025
The strongest solar flare in the day
Flare of C3.7 level (normal) — in 07:49
Solar activity index
Value for Oct 21, 2025 24:00 (end on the day). The maximum value is 10.0
Solar flares in 2 days
Chart of solar activity from Oct 20, 2025 to Oct 21, 2025
Time zone — UTC+01 (London) - summer time
This chart in PNG format — high resolution
API data: JSON or TXT
List of solar flares for Oct 21, 2025
Total number of flares of class C and higher — 3 flares
C type — 3 | M type — 0 | X type — 0
| start | maximum | end | region | |
|---|---|---|---|---|
|
C3.7
|
07:36 | 07:49 | 07:59 | — |
|
C1.3
|
06:54 | 07:00 | 07:05 | 4248 |
|
C2.1
|
00:16 | 00:24 | 00:33 | 4248 |