Solar flares on February 18, 2011
The most powerful solar flare in 24 hours
M6.6 (strong) flare - February 18 at 12:11 PM
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+02 (Riga)
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 | 22:56 | 23:04 | 23:14 | 1162 |
| C7.1 | 21:02 | 21:18 | 21:28 | 1162 |
| C3.2 | 20:13 | 20:21 | 20:25 | 1158 |
| C3.8 | 19:48 | 19:53 | 20:02 | 1162 |
| C2.1 | 18:42 | 18:45 | 18:53 | 1162 |
| C2.3 | 18:36 | 18:39 | 18:41 | 1162 |
| C5.5 | 17:48 | 17:55 | 17:59 | 1162 |
| C5.0 | 16:57 | 17:05 | 17:09 | 1158 |
| C4.0 | 16:27 | 16:32 | 16:35 | 1158 |
| M1.0 | 16:00 | 16:08 | 16:15 | 1162 |
| M1.4 | 14:59 | 15:03 | 15:06 | 1158 |
| C3.0 | 14:16 | 14:20 | 14:24 | 1162 |
| M1.0 | 12:23 | 12:26 | 12:37 | 1162 |
| M6.6 | 11:55 | 12:11 | 12:15 | 1158 |
| C4.2 | 11:03 | 11:11 | 11:19 | 1162 |
| C7.6 | 09:13 | 09:24 | 09:38 | 1162 |
| C8.5 | 08:27 | 08:33 | 08:39 | 1158 |
| C4.0 | 06:44 | 06:51 | 07:01 | 1161 |
| C2.0 | 05:20 | 05:34 | 05:40 | 1161 |
| C1.7 | 03:02 | 03:08 | 03:14 | 1158 |