Solar flares on September 21, 2023
The most powerful solar flare in 24 hours
M8.7 (strong) flare - September 21 at 12:54 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+00
List of solar flares for September 21, 2023
The total number of solar flares of class C and higher — 7 flares
C class — 6 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.2 | 15:59 | 16:07 | 16:15 | 3443 |
| C2.4 | 14:43 | 14:53 | 15:05 | 3438 |
| M8.7 | 12:42 | 12:54 | 13:02 | 3435 |
| C2.5 | 10:09 | 10:20 | 10:26 | 3435 |
| C2.1 | 09:38 | 09:46 | 09:52 | 3443 |
| C1.6 | 05:51 | 05:57 | 06:05 | 3438 |
| C2.2 | 01:32 | 01:43 | 02:06 | 3442 |