Solar flares on September 21, 2001
The most powerful solar flare in 24 hours
C7.7 (normal) flare - September 21 at 10:02 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+03 (Riga)
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 | 23:08 | 23:12 | 23:18 | 9631 |
| C3.6 | 19:42 | 19:45 | 19:47 | 9632 |
| C7.7 | 09:44 | 10:02 | 10:07 | 9631 |
| C3.1 | 09:36 | 09:40 | 09:42 | 9632 |
| C4.1 | 07:48 | 07:55 | 08:02 | 9620 |
| C2.5 | 04:17 | 04:29 | 04:32 | 9620 |