Solar flares on September 21, 2001
The most powerful solar flare in 24 hours
C7.7 (normal) flare - September 21 at 1:02 AM
Solar activity index
Value as of the end of the day on September 21, 2001
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 20, 2001 to September 21, 2001
Time zone — UTC-06 (Red deer) — summer time
List of solar flares for September 21, 2001
The total number of solar flares of class C and higher — 7 flares
C class — 7 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C4.9 | 23:41 | 23:44 | 23:47 | 9616 |
| C3.4 | 22:44 | 22:54 | 23:09 | — |
| C3.1 | 18:33 | 18:37 | 18:46 | — |
| C3.8 | 14:08 | 14:12 | 14:18 | 9631 |
| C3.6 | 10:42 | 10:45 | 10:47 | 9632 |
| C7.7 | 00:44 | 01:02 | 01:07 | 9631 |
| C3.1 | 00:36 | 00:40 | 00:42 | 9632 |