Solar flares on October 21, 2003
The most powerful solar flare in 24 hours
M1.0 (strong) flare - October 21 at 10:27 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+02 (Bratislava) — 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 | 21:17 | 21:20 | 21:24 | — |
| C2.5 | 19:57 | 20:00 | 20:03 | 484 |
| C3.4 | 14:42 | 14:45 | 14:52 | — |
| M1.0 | 10:21 | 10:27 | 10:31 | 484 |
| C6.0 | 06:51 | 06:59 | 07:09 | 484 |
| C7.9 | 05:19 | 05:45 | 06:13 | 484 |
| C2.5 | 04:49 | 04:53 | 05:00 | 484 |
| C6.2 | 00:00 | 01:18 | 00:13 | 484 |