Solar flares on September 21, 2023
The most powerful solar flare in 24 hours
M8.7 (strong) flare - September 21 at 8:54 AM
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-04 (Providence) — summer time
List of solar flares for September 21, 2023
The total number of solar flares of class C and higher — 6 flares
C class — 5 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.2 | 11:59 | 12:07 | 12:15 | 3443 |
| C2.4 | 10:43 | 10:53 | 11:05 | 3438 |
| M8.7 | 08:42 | 08:54 | 09:02 | 3435 |
| C2.5 | 06:09 | 06:20 | 06:26 | 3435 |
| C2.1 | 05:38 | 05:46 | 05:52 | 3443 |
| C1.6 | 01:51 | 01:57 | 02:05 | 3438 |