Solar flares on September 17, 2001
The most powerful solar flare in 24 hours
M8.1 (strong) flare - September 17 at 11:50 AM
Solar activity index
Value as of the end of the day on September 17, 2001
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 16, 2001 to September 17, 2001
Time zone — UTC-04 (Quebec) — summer time
List of solar flares for September 17, 2001
The total number of solar flares of class C and higher — 18 flares
C class — 13 | M class — 5 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C6.8 | 22:10 | 22:25 | 22:35 | — |
| C8.2 | 21:48 | 21:53 | 21:59 | — |
| C2.5 | 21:35 | 21:38 | 21:42 | — |
| M1.4 | 20:02 | 20:08 | 20:15 | 9608 |
| M1.0 | 17:32 | 17:46 | 17:55 | 9608 |
| M1.0 | 17:01 | 17:08 | 17:11 | 9616 |
| C3.3 | 15:56 | 16:01 | 16:07 | 9608 |
| C3.3 | 15:38 | 15:42 | 15:46 | — |
| C4.8 | 15:06 | 15:10 | 15:17 | — |
| M8.1 | 11:44 | 11:50 | 11:54 | 9608 |
| C3.3 | 10:29 | 10:39 | 10:50 | — |
| C3.6 | 08:43 | 08:53 | 08:59 | — |
| C3.7 | 07:11 | 07:16 | 07:21 | — |
| C7.0 | 05:26 | 05:41 | 05:48 | 9621 |
| M1.5 | 04:18 | 04:25 | 04:34 | 9616 |
| C3.6 | 02:47 | 02:53 | 03:00 | 9608 |
| C4.4 | 01:42 | 01:46 | 01:49 | — |
| C4.9 | 00:29 | 01:02 | 01:23 | — |