Solar flares on September 18, 2001
The most powerful solar flare in 24 hours
M1.4 (strong) flare - September 18 at 10:37 PM
Solar activity index
Value as of the end of the day on September 18, 2001
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 17, 2001 to September 18, 2001
Time zone — UTC+05:30 (Indore)
List of solar flares for September 18, 2001
The total number of solar flares of class C and higher — 17 flares
C class — 11 | M class — 6 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C6.4 | 22:49 | 22:53 | 22:57 | — |
| M1.4 | 22:32 | 22:37 | 22:39 | 9628 |
| M1.0 | 21:19 | 21:22 | 21:24 | — |
| M1.3 | 21:01 | 21:08 | 21:13 | 9620 |
| C6.9 | 20:08 | 20:11 | 20:15 | — |
| C7.3 | 11:55 | 11:58 | 12:01 | — |
| C6.4 | 11:43 | 11:48 | 11:53 | — |
| C7.5 | 09:58 | 10:09 | 10:13 | 9621 |
| C6.8 | 07:40 | 07:55 | 08:05 | — |
| C8.2 | 07:18 | 07:23 | 07:29 | — |
| C2.5 | 07:05 | 07:08 | 07:12 | — |
| M1.4 | 05:32 | 05:38 | 05:45 | 9608 |
| M1.0 | 03:02 | 03:16 | 03:25 | 9608 |
| M1.0 | 02:31 | 02:38 | 02:41 | 9616 |
| C3.3 | 01:26 | 01:31 | 01:37 | 9608 |
| C3.3 | 01:08 | 01:12 | 01:16 | — |
| C4.8 | 00:36 | 00:40 | 00:47 | — |