Solar flares on September 23, 2011
The most powerful solar flare in 24 hours
M1.9 (strong) flare - September 23 at 11:56 PM
Solar activity index
Value as of the end of the day on September 23, 2011
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 22, 2011 to September 23, 2011
Time zone — UTC+00
List of solar flares for September 23, 2011
The total number of solar flares of class C and higher — 12 flares
C class — 9 | M class — 3 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| M1.9 | 23:48 | 23:56 | 00:04 | 1302 |
| M1.6 | 21:54 | 22:15 | 22:34 | 1295 |
| C9.6 | 21:29 | 21:43 | 21:48 | 1295 |
| C2.2 | 20:46 | 20:49 | 20:52 | 1295 |
| C3.4 | 19:06 | 19:11 | 19:16 | 1302 |
| C3.0 | 18:11 | 18:22 | 18:35 | — |
| C2.1 | 15:01 | 15:06 | 15:08 | 1302 |
| C3.2 | 12:10 | 12:23 | 12:40 | 1296 |
| C6.9 | 08:40 | 08:50 | 09:20 | 1295 |
| C2.7 | 08:13 | 08:19 | 08:33 | 1295 |
| M1.6 | 01:47 | 01:59 | 02:10 | 1295 |
| C9.6 | 00:29 | 00:33 | 00:37 | — |