Solar flares on October 21, 2015
The most powerful solar flare in 24 hours
C7.7 (normal) flare - October 21 at 11:56 AM
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-06 (Cheyenne) — summer time
List of solar flares for October 21, 2015
The total number of solar flares of class C and higher — 5 flares
C class — 5 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C4.4 | 20:13 | 21:40 | 23:15 | 2434 |
| C7.7 | 11:48 | 11:56 | 12:00 | 2436 |
| C1.1 | 08:28 | 08:31 | 08:33 | 2436 |
| C1.7 | 07:52 | 07:58 | 08:04 | 2436 |
| C2.6 | 05:51 | 06:00 | 06:07 | 2436 |