Solar flares on September 21, 2023
The most powerful solar flare in 24 hours
M8.7 (strong) flare - September 21 at 5:54 PM
Solar activity index
Value as of the end of the day on September 21, 2023
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 20, 2023 to September 21, 2023
Time zone — UTC+05 (Perm)
List of solar flares for September 21, 2023
The total number of solar flares of class C and higher — 10 flares
C class — 9 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.2 | 20:59 | 21:07 | 21:15 | 3443 |
| C2.4 | 19:43 | 19:53 | 20:05 | 3438 |
| M8.7 | 17:42 | 17:54 | 18:02 | 3435 |
| C2.5 | 15:09 | 15:20 | 15:26 | 3435 |
| C2.1 | 14:38 | 14:46 | 14:52 | 3443 |
| C1.6 | 10:51 | 10:57 | 11:05 | 3438 |
| C2.2 | 06:32 | 06:43 | 07:06 | 3442 |
| C2.3 | 04:17 | 04:21 | 04:25 | 3438 |
| C4.7 | 02:27 | 02:38 | 02:48 | 3442 |
| C1.3 | 01:29 | 01:38 | 01:44 | — |