Solar flares on October 21, 2015
The most powerful solar flare in 24 hours
C7.7 (normal) flare - October 21 at 1:56 PM
Solar activity index
Value as of the end of the day on October 21, 2015
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from October 20, 2015 to October 21, 2015
Time zone — UTC-04 (Washington) — summer time
List of solar flares for October 21, 2015
The total number of solar flares of class C and higher — 7 flares
C class — 7 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C4.4 | 22:13 | 23:40 | 01:15 | 2434 |
| C7.7 | 13:48 | 13:56 | 14:00 | 2436 |
| C1.1 | 10:28 | 10:31 | 10:33 | 2436 |
| C1.7 | 09:52 | 09:58 | 10:04 | 2436 |
| C2.6 | 07:51 | 08:00 | 08:07 | 2436 |
| C2.7 | 01:31 | 01:37 | 01:43 | 2436 |
| C6.3 | 00:29 | 00:34 | 00:36 | 2436 |