Solar flares on October 21, 2013
The most powerful solar flare in 24 hours
C2.4 (normal) flare - October 21 at 5:10 PM
Solar activity index
Value as of the end of the day on October 21, 2013
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from October 20, 2013 to October 21, 2013
Time zone — UTC+01 (London) — summer time
List of solar flares for October 21, 2013
The total number of solar flares of class C and higher — 8 flares
C class — 8 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C2.0 | 23:31 | 23:46 | 23:58 | 1875 |
| C1.5 | 21:56 | 22:00 | 22:07 | 1875 |
| C1.6 | 21:20 | 21:34 | 21:39 | — |
| C2.4 | 16:40 | 17:10 | 17:16 | 1875 |
| C1.1 | 15:33 | 15:44 | 16:36 | 1877 |
| C1.0 | 10:19 | 10:22 | 10:25 | 1877 |
| C1.6 | 09:09 | 09:13 | 09:17 | 1875 |
| C1.7 | 08:06 | 08:14 | 08:18 | — |