Solar flares on February 18, 2011
The most powerful solar flare in 24 hours
M6.6 (strong) flare - February 18 at 10:11 AM
Solar activity index
Value as of the end of the day on February 18, 2011
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from February 17, 2011 to February 18, 2011
Time zone — UTC+00
List of solar flares for February 18, 2011
The total number of solar flares of class C and higher — 20 flares
C class — 15 | M class — 5 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| M1.3 | 20:56 | 21:04 | 21:14 | 1162 |
| C7.1 | 19:02 | 19:18 | 19:28 | 1162 |
| C3.2 | 18:13 | 18:21 | 18:25 | 1158 |
| C3.8 | 17:48 | 17:53 | 18:02 | 1162 |
| C2.1 | 16:42 | 16:45 | 16:53 | 1162 |
| C2.3 | 16:36 | 16:39 | 16:41 | 1162 |
| C5.5 | 15:48 | 15:55 | 15:59 | 1162 |
| C5.0 | 14:57 | 15:05 | 15:09 | 1158 |
| C4.0 | 14:27 | 14:32 | 14:35 | 1158 |
| M1.0 | 14:00 | 14:08 | 14:15 | 1162 |
| M1.4 | 12:59 | 13:03 | 13:06 | 1158 |
| C3.0 | 12:16 | 12:20 | 12:24 | 1162 |
| M1.0 | 10:23 | 10:26 | 10:37 | 1162 |
| M6.6 | 09:55 | 10:11 | 10:15 | 1158 |
| C4.2 | 09:03 | 09:11 | 09:19 | 1162 |
| C7.6 | 07:13 | 07:24 | 07:38 | 1162 |
| C8.5 | 06:27 | 06:33 | 06:39 | 1158 |
| C4.0 | 04:44 | 04:51 | 05:01 | 1161 |
| C2.0 | 03:20 | 03:34 | 03:40 | 1161 |
| C1.7 | 01:02 | 01:08 | 01:14 | 1158 |