Solar flares on September 18, 2001
The most powerful solar flare in 24 hours
M1.4 (strong) flare - September 18 at 12:07 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-05 (Springfield) — summer time
List of solar flares for September 18, 2001
The total number of solar flares of class C and higher — 12 flares
C class — 9 | M class — 3 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.3 | 22:38 | 22:43 | 22:55 | 9628 |
| C4.9 | 15:44 | 15:48 | 15:51 | — |
| C5.6 | 14:53 | 14:57 | 15:00 | — |
| C4.1 | 14:20 | 14:25 | 14:29 | — |
| C3.7 | 13:42 | 13:45 | 13:48 | — |
| C6.4 | 12:19 | 12:23 | 12:27 | — |
| M1.4 | 12:02 | 12:07 | 12:09 | 9628 |
| M1.0 | 10:49 | 10:52 | 10:54 | — |
| M1.3 | 10:31 | 10:38 | 10:43 | 9620 |
| C6.9 | 09:38 | 09:41 | 09:45 | — |
| C7.3 | 01:25 | 01:28 | 01:31 | — |
| C6.4 | 01:13 | 01:18 | 01:23 | — |