Solar flares on September 20, 2001
The most powerful solar flare in 24 hours
M1.5 (strong) flare - September 20 at 1:17 PM
Solar activity index
Value as of the end of the day on September 20, 2001
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 19, 2001 to September 20, 2001
Time zone — UTC-05 (Jackson) — summer time
List of solar flares for September 20, 2001
The total number of solar flares of class C and higher — 9 flares
C class — 8 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C4.1 | 23:48 | 23:55 | 00:02 | 9620 |
| C2.5 | 20:17 | 20:29 | 20:32 | 9620 |
| C3.8 | 13:48 | 13:51 | 13:54 | 9628 |
| M1.5 | 13:12 | 13:17 | 13:21 | 9631 |
| C2.2 | 10:50 | 10:58 | 11:04 | — |
| C3.4 | 09:35 | 09:41 | 09:45 | — |
| C2.4 | 07:54 | 08:03 | 08:17 | — |
| C2.5 | 04:58 | 05:31 | 05:53 | — |
| C7.8 | 00:03 | 00:10 | 00:19 | 9628 |