Solar flares on October 21, 2003
The most powerful solar flare in 24 hours
M1.0 (strong) flare - October 21 at 9:27 AM
Solar activity index
Value as of the end of the day on October 21, 2003
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from October 20, 2003 to October 21, 2003
Time zone — UTC+01 (London) — summer time
List of solar flares for October 21, 2003
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 |
|---|---|---|---|---|
| C3.3 | 20:17 | 20:20 | 20:24 | — |
| C2.5 | 18:57 | 19:00 | 19:03 | 484 |
| C3.4 | 13:42 | 13:45 | 13:52 | — |
| M1.0 | 09:21 | 09:27 | 09:31 | 484 |
| C6.0 | 05:51 | 05:59 | 06:09 | 484 |
| C7.9 | 04:19 | 04:45 | 05:13 | 484 |
| C2.5 | 03:49 | 03:53 | 04:00 | 484 |
| C6.2 | 23:00 | 00:18 | 23:13 | 484 |