Solar flares on September 20, 2001
The most powerful solar flare in 24 hours
M1.5 (strong) flare - September 20 at 2:17 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-04 (Dover) — summer time
List of solar flares for September 20, 2001
The total number of solar flares of class C and higher — 8 flares
C class — 7 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C2.5 | 21:17 | 21:29 | 21:32 | 9620 |
| C3.8 | 14:48 | 14:51 | 14:54 | 9628 |
| M1.5 | 14:12 | 14:17 | 14:21 | 9631 |
| C2.2 | 11:50 | 11:58 | 12:04 | — |
| C3.4 | 10:35 | 10:41 | 10:45 | — |
| C2.4 | 08:54 | 09:03 | 09:17 | — |
| C2.5 | 05:58 | 06:31 | 06:53 | — |
| C7.8 | 01:03 | 01:10 | 01:19 | 9628 |