Solar flares on October 21, 2015
The most powerful solar flare in 24 hours
C7.7 (normal) flare - October 21 at 12:56 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-05 (Des Moines) — summer time
List of solar flares for October 21, 2015
The total number of solar flares of class C and higher — 6 flares
C class — 6 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C4.4 | 21:13 | 22:40 | 00:15 | 2434 |
| C7.7 | 12:48 | 12:56 | 13:00 | 2436 |
| C1.1 | 09:28 | 09:31 | 09:33 | 2436 |
| C1.7 | 08:52 | 08:58 | 09:04 | 2436 |
| C2.6 | 06:51 | 07:00 | 07:07 | 2436 |
| C2.7 | 00:31 | 00:37 | 00:43 | 2436 |