Solar flares on October 21, 2002
The most powerful solar flare in 24 hours
C6.6 (normal) flare - October 21 at 5:13 PM
Solar activity index
Value as of the end of the day on October 21, 2002
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from October 20, 2002 to October 21, 2002
Time zone — UTC-04 (Providence) — summer time
List of solar flares for October 21, 2002
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 |
|---|---|---|---|---|
| C4.7 | 19:32 | 19:58 | 20:07 | 162 |
| C6.6 | 17:01 | 17:13 | 17:24 | 160 |
| C2.0 | 16:04 | 16:08 | 16:17 | — |
| C1.7 | 11:01 | 11:05 | 11:12 | 162 |
| C3.7 | 08:15 | 08:27 | 08:36 | 162 |
| C2.9 | 07:30 | 08:04 | 08:15 | — |
| C2.3 | 04:19 | 04:36 | 04:41 | 162 |
| C3.1 | 00:52 | 01:23 | 01:30 | 162 |
| C3.6 | 00:16 | 00:19 | 00:22 | 154 |