Solar flares on September 21, 2023
The most powerful solar flare in 24 hours
M8.7 (strong) flare - September 21 at 2:54 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+02 (Vienna) — summer time
List of solar flares for September 21, 2023
The total number of solar flares of class C and higher — 8 flares
C class — 7 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.2 | 17:59 | 18:07 | 18:15 | 3443 |
| C2.4 | 16:43 | 16:53 | 17:05 | 3438 |
| M8.7 | 14:42 | 14:54 | 15:02 | 3435 |
| C2.5 | 12:09 | 12:20 | 12:26 | 3435 |
| C2.1 | 11:38 | 11:46 | 11:52 | 3443 |
| C1.6 | 07:51 | 07:57 | 08:05 | 3438 |
| C2.2 | 03:32 | 03:43 | 04:06 | 3442 |
| C2.3 | 01:17 | 01:21 | 01:25 | 3438 |