Solar flares on September 21, 2023
The most powerful solar flare in 24 hours
M8.7 (strong) flare - September 21 at 3:54 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+03 (Tallinn)
List of solar flares for September 21, 2023
The total number of solar flares of class C and higher — 9 flares
C class — 8 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.2 | 18:59 | 19:07 | 19:15 | 3443 |
| C2.4 | 17:43 | 17:53 | 18:05 | 3438 |
| M8.7 | 15:42 | 15:54 | 16:02 | 3435 |
| C2.5 | 13:09 | 13:20 | 13:26 | 3435 |
| C2.1 | 12:38 | 12:46 | 12:52 | 3443 |
| C1.6 | 08:51 | 08:57 | 09:05 | 3438 |
| C2.2 | 04:32 | 04:43 | 05:06 | 3442 |
| C2.3 | 02:17 | 02:21 | 02:25 | 3438 |
| C4.7 | 00:27 | 00:38 | 00:48 | 3442 |