Solar flares on October 20, 2001
The most powerful solar flare in 24 hours
C4.6 (normal) flare - October 20 at 5:12 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-04 (Kapuskasing) — summer time
List of solar flares for October 20, 2001
The total number of solar flares of class C and higher — 9 flares
C class — 9 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.4 | 23:21 | 23:24 | 23:28 | — |
| C1.9 | 21:47 | 21:51 | 21:54 | — |
| C2.1 | 20:28 | 20:31 | 20:33 | — |
| C4.3 | 20:04 | 20:11 | 20:15 | 9672 |
| C2.5 | 18:33 | 18:38 | 18:41 | 9674 |
| C3.3 | 18:04 | 18:11 | 18:13 | — |
| C3.0 | 17:44 | 17:47 | 17:54 | 9670 |
| C4.6 | 17:07 | 17:12 | 17:15 | 9674 |
| C4.1 | 03:00 | 03:09 | 03:25 | 9670 |