Solar flares on September 20, 2011
The most powerful solar flare in 24 hours
C9.5 (normal) flare - September 20 at 1:13 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-04 (Washington) — 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 |
|---|---|---|---|---|
| C2.7 | 20:55 | 21:07 | 21:14 | 1301 |
| C3.0 | 17:38 | 17:42 | 17:46 | 1295 |
| C2.7 | 15:23 | 16:00 | 16:14 | 1295 |
| C1.6 | 13:35 | 13:42 | 13:50 | 1295 |
| C1.5 | 11:45 | 12:33 | 12:57 | — |
| C2.5 | 08:44 | 09:53 | 10:22 | 1301 |
| C1.7 | 08:28 | 08:34 | 08:38 | 1301 |
| C1.7 | 08:15 | 08:19 | 08:26 | — |
| C1.6 | 07:48 | 07:52 | 07:56 | 1296 |
| C2.0 | 02:44 | 02:56 | 03:00 | 1301 |
| C9.5 | 01:00 | 01:13 | 01:17 | 1296 |