Solar flares on October 20, 2001
The most powerful solar flare in 24 hours
C7.8 (normal) flare - October 20 at 11:37 PM
Solar activity index
Value as of the end of the day on October 20, 2001
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from October 19, 2001 to October 20, 2001
Time zone — UTC-05 (Springfield) — summer time
List of solar flares for October 20, 2001
The total number of solar flares of class C and higher — 10 flares
C class — 10 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C7.8 | 23:33 | 23:37 | 23:39 | — |
| C1.4 | 22:21 | 22:24 | 22:28 | — |
| C1.9 | 20:47 | 20:51 | 20:54 | — |
| C2.1 | 19:28 | 19:31 | 19:33 | — |
| C4.3 | 19:04 | 19:11 | 19:15 | 9672 |
| C2.5 | 17:33 | 17:38 | 17:41 | 9674 |
| C3.3 | 17:04 | 17:11 | 17:13 | — |
| C3.0 | 16:44 | 16:47 | 16:54 | 9670 |
| C4.6 | 16:07 | 16:12 | 16:15 | 9674 |
| C4.1 | 02:00 | 02:09 | 02:25 | 9670 |