Solar flares on September 20, 2011
The most powerful solar flare in 24 hours
C9.5 (normal) flare - September 20 at 6:13 AM
Solar activity index
Value as of the end of the day on September 20, 2011
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 19, 2011 to September 20, 2011
Time zone — UTC+01 (London) — summer time
List of solar flares for September 20, 2011
The total number of solar flares of class C and higher — 11 flares
C class — 11 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.0 | 22:38 | 22:42 | 22:46 | 1295 |
| C2.7 | 20:23 | 21:00 | 21:14 | 1295 |
| C1.6 | 18:35 | 18:42 | 18:50 | 1295 |
| C1.5 | 16:45 | 17:33 | 17:57 | — |
| C2.5 | 13:44 | 14:53 | 15:22 | 1301 |
| C1.7 | 13:28 | 13:34 | 13:38 | 1301 |
| C1.7 | 13:15 | 13:19 | 13:26 | — |
| C1.6 | 12:48 | 12:52 | 12:56 | 1296 |
| C2.0 | 07:44 | 07:56 | 08:00 | 1301 |
| C9.5 | 06:00 | 06:13 | 06:17 | 1296 |
| C1.4 | 01:15 | 01:19 | 01:23 | 1296 |