Solar flares on September 18, 2011
The most powerful solar flare in 24 hours
C3.8 (normal) flare - September 18 at 11:57 AM
Solar activity index
Value as of the end of the day on September 18, 2011
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 17, 2011 to September 18, 2011
Time zone — UTC+01 (London) — summer time
List of solar flares for September 18, 2011
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 |
|---|---|---|---|---|
| C1.6 | 23:23 | 23:27 | 23:29 | 1295 |
| C2.0 | 16:48 | 16:52 | 16:58 | 1295 |
| C3.8 | 10:48 | 11:57 | 12:37 | 1295 |
| C2.9 | 08:32 | 08:35 | 08:37 | 1301 |
| C1.2 | 04:59 | 05:02 | 05:05 | — |
| C1.6 | 02:26 | 02:30 | 02:32 | — |