Solar flares on February 18, 2011
The most powerful solar flare in 24 hours
M6.6 (strong) flare - February 18 at 2:11 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-08 (Carson City)
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 |
|---|---|---|---|---|
| C1.9 | 23:40 | 23:44 | 23:47 | 1158 |
| C2.6 | 22:57 | 23:05 | 23:14 | 1162 |
| C3.4 | 18:56 | 19:03 | 19:11 | 1161 |
| C1.8 | 18:21 | 18:25 | 18:30 | 1158 |
| C1.3 | 17:33 | 17:37 | 17:41 | 1158 |
| M1.3 | 12:56 | 13:04 | 13:14 | 1162 |
| C7.1 | 11:02 | 11:18 | 11:28 | 1162 |
| C3.2 | 10:13 | 10:21 | 10:25 | 1158 |
| C3.8 | 09:48 | 09:53 | 10:02 | 1162 |
| C2.1 | 08:42 | 08:45 | 08:53 | 1162 |
| C2.3 | 08:36 | 08:39 | 08:41 | 1162 |
| C5.5 | 07:48 | 07:55 | 07:59 | 1162 |
| C5.0 | 06:57 | 07:05 | 07:09 | 1158 |
| C4.0 | 06:27 | 06:32 | 06:35 | 1158 |
| M1.0 | 06:00 | 06:08 | 06:15 | 1162 |
| M1.4 | 04:59 | 05:03 | 05:06 | 1158 |
| C3.0 | 04:16 | 04:20 | 04:24 | 1162 |
| M1.0 | 02:23 | 02:26 | 02:37 | 1162 |
| M6.6 | 01:55 | 02:11 | 02:15 | 1158 |
| C4.2 | 01:03 | 01:11 | 01:19 | 1162 |