Solar flares on December 18, 2003
The most powerful solar flare in 24 hours
C9.3 (normal) flare - December 18 at 11:18 PM
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-09 (Anchorage)
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 |
|---|---|---|---|---|
| C9.3 | 23:05 | 23:18 | 23:30 | 528 |
| C2.1 | 21:55 | 22:03 | 22:10 | 525 |
| C2.0 | 16:31 | 16:39 | 16:41 | — |
| C4.6 | 16:00 | 16:07 | 16:10 | 525 |
| C2.5 | 15:23 | 15:28 | 15:35 | 525 |
| C1.3 | 14:42 | 14:46 | 14:54 | — |
| C1.7 | 13:52 | 13:57 | 14:08 | — |
| C3.5 | 13:09 | 13:16 | 13:20 | 525 |
| C1.9 | 11:16 | 11:24 | 11:30 | 525 |
| C1.4 | 09:36 | 09:40 | 09:43 | — |
| C1.4 | 05:20 | 05:29 | 05:37 | — |
| C1.0 | 04:43 | 04:51 | 04:59 | — |
| C2.9 | 03:28 | 03:37 | 03:43 | 525 |
| C5.5 | 03:00 | 03:09 | 03:11 | — |
| C1.4 | 02:42 | 02:47 | 02:50 | — |
| C8.6 | 00:19 | 00:31 | 00:37 | 525 |