Solar flares on February 18, 2011
The most powerful solar flare in 24 hours
M6.6 (strong) flare - February 18 at 3:11 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-07 (Fort Smith)
List of solar flares for February 18, 2011
The total number of solar flares of class C and higher — 19 flares
C class — 14 | M class — 5 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.4 | 19:56 | 20:03 | 20:11 | 1161 |
| C1.8 | 19:21 | 19:25 | 19:30 | 1158 |
| C1.3 | 18:33 | 18:37 | 18:41 | 1158 |
| M1.3 | 13:56 | 14:04 | 14:14 | 1162 |
| C7.1 | 12:02 | 12:18 | 12:28 | 1162 |
| C3.2 | 11:13 | 11:21 | 11:25 | 1158 |
| C3.8 | 10:48 | 10:53 | 11:02 | 1162 |
| C2.1 | 09:42 | 09:45 | 09:53 | 1162 |
| C2.3 | 09:36 | 09:39 | 09:41 | 1162 |
| C5.5 | 08:48 | 08:55 | 08:59 | 1162 |
| C5.0 | 07:57 | 08:05 | 08:09 | 1158 |
| C4.0 | 07:27 | 07:32 | 07:35 | 1158 |
| M1.0 | 07:00 | 07:08 | 07:15 | 1162 |
| M1.4 | 05:59 | 06:03 | 06:06 | 1158 |
| C3.0 | 05:16 | 05:20 | 05:24 | 1162 |
| M1.0 | 03:23 | 03:26 | 03:37 | 1162 |
| M6.6 | 02:55 | 03:11 | 03:15 | 1158 |
| C4.2 | 02:03 | 02:11 | 02:19 | 1162 |
| C7.6 | 00:13 | 00:24 | 00:38 | 1162 |