Solar flares on September 18, 2001
The most powerful solar flare in 24 hours
M1.4 (strong) flare - September 18 at 8:07 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+03 (Cherkessk)
List of solar flares for September 18, 2001
The total number of solar flares of class C and higher — 18 flares
C class — 12 | M class — 6 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C4.9 | 23:44 | 23:48 | 23:51 | — |
| C5.6 | 22:53 | 22:57 | 23:00 | — |
| C4.1 | 22:20 | 22:25 | 22:29 | — |
| C3.7 | 21:42 | 21:45 | 21:48 | — |
| C6.4 | 20:19 | 20:23 | 20:27 | — |
| M1.4 | 20:02 | 20:07 | 20:09 | 9628 |
| M1.0 | 18:49 | 18:52 | 18:54 | — |
| M1.3 | 18:31 | 18:38 | 18:43 | 9620 |
| C6.9 | 17:38 | 17:41 | 17:45 | — |
| C7.3 | 09:25 | 09:28 | 09:31 | — |
| C6.4 | 09:13 | 09:18 | 09:23 | — |
| C7.5 | 07:28 | 07:39 | 07:43 | 9621 |
| C6.8 | 05:10 | 05:25 | 05:35 | — |
| C8.2 | 04:48 | 04:53 | 04:59 | — |
| C2.5 | 04:35 | 04:38 | 04:42 | — |
| M1.4 | 03:02 | 03:08 | 03:15 | 9608 |
| M1.0 | 00:32 | 00:46 | 00:55 | 9608 |
| M1.0 | 00:01 | 00:08 | 00:11 | 9616 |