Solar flares — September 21, 2025
The strongest solar flare in the day
Flare of C3.4 level (normal) — in 00:11
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+04 (Tbilisi)
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
|
21:33 | 21:43 | 21:50 | 4224 |
|
C2.3
|
21:01 | 21:08 | 21:14 | 4220 |
|
C2.1
|
18:42 | 18:45 | 18:49 | 4217 |
|
C1.6
|
15:55 | 16:03 | 16:20 | 4228 |
|
C1.6
|
13:53 | 14:01 | 14:06 | 4217 |
|
C1.7
|
11:17 | 11:27 | 11:40 | — |
|
C2.1
|
10:33 | 10:47 | 11:08 | 4220 |
|
C2.8
|
09:27 | 09:33 | 09:49 | 4220 |
|
C2.4
|
08:37 | 09:07 | 09:45 | 4217 |
|
C3.4
|
23:57 | 00:11 | 00:34 | 4220 |