Solar flares on September 21, 2001
The most powerful solar flare in 24 hours
C7.7 (normal) flare - September 21 at 7:02 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+00
List of solar flares for September 21, 2001
The total number of solar flares of class C and higher — 6 flares
C class — 6 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.8 | 20:08 | 20:12 | 20:18 | 9631 |
| C3.6 | 16:42 | 16:45 | 16:47 | 9632 |
| C7.7 | 06:44 | 07:02 | 07:07 | 9631 |
| C3.1 | 06:36 | 06:40 | 06:42 | 9632 |
| C4.1 | 04:48 | 04:55 | 05:02 | 9620 |
| C2.5 | 01:17 | 01:29 | 01:32 | 9620 |