Solar flares on December 18, 2003
The most powerful solar flare in 24 hours
C8.6 (normal) flare - December 18 at 9:31 AM
Solar activity index
Value as of the end of the day on December 18, 2003
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from December 17, 2003 to December 18, 2003
Time zone — UTC+00
List of solar flares for December 18, 2003
The total number of solar flares of class C and higher — 16 flares
C class — 16 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.3 | 23:42 | 23:46 | 23:54 | — |
| C1.7 | 22:52 | 22:57 | 23:08 | — |
| C3.5 | 22:09 | 22:16 | 22:20 | 525 |
| C1.9 | 20:16 | 20:24 | 20:30 | 525 |
| C1.4 | 18:36 | 18:40 | 18:43 | — |
| C1.4 | 14:20 | 14:29 | 14:37 | — |
| C1.0 | 13:43 | 13:51 | 13:59 | — |
| C2.9 | 12:28 | 12:37 | 12:43 | 525 |
| C5.5 | 12:00 | 12:09 | 12:11 | — |
| C1.4 | 11:42 | 11:47 | 11:50 | — |
| C8.6 | 09:19 | 09:31 | 09:37 | 525 |
| C3.4 | 08:39 | 08:43 | 08:47 | — |
| C1.3 | 04:12 | 04:18 | 04:27 | — |
| C2.1 | 01:46 | 01:51 | 01:55 | — |
| C1.3 | 01:01 | 01:12 | 01:26 | — |
| C1.1 | 00:28 | 00:32 | 00:39 | — |