Solar flares on February 17, 2011
The most powerful solar flare in 24 hours
C4.0 (normal) flare - February 17 at 11:51 PM
Solar activity index
Value as of the end of the day on February 17, 2011
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from February 16, 2011 to February 17, 2011
Time zone — UTC-05 (Columbus)
List of solar flares for February 17, 2011
The total number of solar flares of class C and higher — 12 flares
C class — 12 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C4.0 | 23:44 | 23:51 | 00:01 | 1161 |
| C2.0 | 22:20 | 22:34 | 22:40 | 1161 |
| C1.7 | 20:02 | 20:08 | 20:14 | 1158 |
| C1.1 | 16:30 | 16:35 | 16:40 | 1158 |
| C1.3 | 10:49 | 10:54 | 11:04 | 1158 |
| C2.4 | 07:33 | 07:36 | 07:39 | 1158 |
| C2.2 | 05:38 | 05:44 | 05:49 | — |
| C2.6 | 05:25 | 05:28 | 05:32 | 1158 |
| C1.9 | 04:24 | 04:30 | 04:35 | 1158 |
| C1.2 | 03:09 | 03:13 | 03:18 | 1158 |
| C1.2 | 01:44 | 01:47 | 01:51 | 1158 |
| C1.0 | 00:33 | 00:36 | 00:40 | 1158 |