Solar flares on September 11, 2001
The most powerful solar flare in 24 hours
M4.5 (strong) flare - September 11 at 5:36 PM
Solar activity index
Value as of the end of the day on September 11, 2001
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 10, 2001 to September 11, 2001
Time zone — UTC-03 (Halifax) — summer time
List of solar flares for September 11, 2001
The total number of solar flares of class C and higher — 10 flares
C class — 8 | M class — 2 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.5 | 21:52 | 21:56 | 21:59 | — |
| C4.8 | 19:31 | 19:35 | 19:37 | 9610 |
| M4.5 | 17:25 | 17:36 | 17:43 | 9616 |
| C4.6 | 16:50 | 16:54 | 16:58 | — |
| C3.2 | 11:00 | 11:37 | 12:08 | 9615 |
| C2.9 | 09:30 | 09:33 | 09:35 | — |
| C3.3 | 06:47 | 06:51 | 06:55 | — |
| C9.7 | 06:33 | 06:37 | 06:39 | — |
| M1.2 | 03:53 | 04:04 | 04:22 | — |
| C5.1 | 00:32 | 00:49 | 01:05 | — |