Solar flares on October 21, 2001
The most powerful solar flare in 24 hours
M2.5 (strong) flare - October 21 at 6:36 AM
Solar activity index
Value as of the end of the day on October 21, 2001
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from October 20, 2001 to October 21, 2001
Time zone — UTC-05 (Springfield) — summer time
List of solar flares for October 21, 2001
The total number of solar flares of class C and higher — 8 flares
C class — 5 | M class — 3 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C6.8 | 22:44 | 22:59 | 23:23 | 9669 |
| M1.0 | 19:22 | 19:40 | 19:48 | 9658 |
| C2.0 | 15:54 | 15:58 | 16:00 | — |
| C2.5 | 08:11 | 08:26 | 08:31 | 9670 |
| M2.5 | 06:12 | 06:36 | 06:48 | 9661 |
| C2.7 | 02:53 | 02:57 | 03:00 | — |
| C2.7 | 00:44 | 00:47 | 00:51 | — |
| M1.3 | 00:09 | 00:18 | 00:27 | — |