Solar flares on September 20, 2001
The most powerful solar flare in 24 hours
M1.5 (strong) flare - September 20 at 9:17 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+03 (Pskov)
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 |
|---|---|---|---|---|
| C3.8 | 21:48 | 21:51 | 21:54 | 9628 |
| M1.5 | 21:12 | 21:17 | 21:21 | 9631 |
| C2.2 | 18:50 | 18:58 | 19:04 | — |
| C3.4 | 17:35 | 17:41 | 17:45 | — |
| C2.4 | 15:54 | 16:03 | 16:17 | — |
| C2.5 | 12:58 | 13:31 | 13:53 | — |
| C7.8 | 08:03 | 08:10 | 08:19 | 9628 |
| C3.4 | 05:24 | 05:32 | 05:36 | — |