Solar flares on September 17, 2001
The most powerful solar flare in 24 hours
M8.1 (strong) flare - September 17 at 3:50 PM
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+00
List of solar flares for September 17, 2001
The total number of solar flares of class C and higher — 15 flares
C class — 11 | M class — 4 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| M1.0 | 21:32 | 21:46 | 21:55 | 9608 |
| M1.0 | 21:01 | 21:08 | 21:11 | 9616 |
| C3.3 | 19:56 | 20:01 | 20:07 | 9608 |
| C3.3 | 19:38 | 19:42 | 19:46 | — |
| C4.8 | 19:06 | 19:10 | 19:17 | — |
| M8.1 | 15:44 | 15:50 | 15:54 | 9608 |
| C3.3 | 14:29 | 14:39 | 14:50 | — |
| C3.6 | 12:43 | 12:53 | 12:59 | — |
| C3.7 | 11:11 | 11:16 | 11:21 | — |
| C7.0 | 09:26 | 09:41 | 09:48 | 9621 |
| M1.5 | 08:18 | 08:25 | 08:34 | 9616 |
| C3.6 | 06:47 | 06:53 | 07:00 | 9608 |
| C4.4 | 05:42 | 05:46 | 05:49 | — |
| C4.9 | 04:29 | 05:02 | 05:23 | — |
| C3.9 | 02:04 | 02:07 | 02:10 | — |