Solar flares on September 18, 2001
The most powerful solar flare in 24 hours
M1.4 (strong) flare - September 18 at 1:07 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-04 (Kapuskasing) — summer time
List of solar flares for September 18, 2001
The total number of solar flares of class C and higher — 13 flares
C class — 10 | M class — 3 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.3 | 23:38 | 23:43 | 23:55 | 9628 |
| C4.9 | 16:44 | 16:48 | 16:51 | — |
| C5.6 | 15:53 | 15:57 | 16:00 | — |
| C4.1 | 15:20 | 15:25 | 15:29 | — |
| C3.7 | 14:42 | 14:45 | 14:48 | — |
| C6.4 | 13:19 | 13:23 | 13:27 | — |
| M1.4 | 13:02 | 13:07 | 13:09 | 9628 |
| M1.0 | 11:49 | 11:52 | 11:54 | — |
| M1.3 | 11:31 | 11:38 | 11:43 | 9620 |
| C6.9 | 10:38 | 10:41 | 10:45 | — |
| C7.3 | 02:25 | 02:28 | 02:31 | — |
| C6.4 | 02:13 | 02:18 | 02:23 | — |
| C7.5 | 00:28 | 00:39 | 00:43 | 9621 |