Solar flares — Sep 21, 2025
The strongest solar flare in the day
Flare of C6.6 level (normal) — in 22:16
Solar activity index
Value for Sep 21, 2025 24:00 (end on the day). The maximum value is 10.0
Solar flares in 2 days
Chart of solar activity from Sep 20, 2025 to Sep 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 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 | |
|---|---|---|---|---|
|
C6.6
|
22:04 | 22:16 | 22:20 | 4223 |
|
C3.3
|
18:33 | 18:43 | 18:50 | 4224 |
|
C2.3
|
18:01 | 18:08 | 18:14 | 4220 |
|
C2.1
|
15:42 | 15:45 | 15:49 | 4217 |
|
C1.6
|
12:55 | 13:03 | 13:20 | 4228 |
|
C1.6
|
10:53 | 11:01 | 11:06 | 4217 |
|
C1.7
|
08:17 | 08:27 | 08:40 | — |
|
C2.1
|
07:33 | 07:47 | 08:08 | 4220 |
|
C2.8
|
06:27 | 06:33 | 06:49 | 4220 |
|
C2.4
|
05:37 | 06:07 | 06:45 | 4217 |