Solar flares on December 18, 2001
The most powerful solar flare in 24 hours
C4.9 (normal) flare - December 18 at 9:32 PM
Solar activity index
Value as of the end of the day on December 18, 2001
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from December 17, 2001 to December 18, 2001
Time zone — UTC-05 (Jacksonville)
List of solar flares for December 18, 2001
The total number of solar flares of class C and higher — 5 flares
C class — 5 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C4.9 | 21:29 | 21:32 | 21:36 | 9742 |
| C3.9 | 20:11 | 20:15 | 20:24 | 9733 |
| C3.7 | 14:59 | 15:03 | 15:07 | 9742 |
| C4.8 | 02:49 | 02:54 | 03:07 | 9733 |
| C1.6 | 02:32 | 02:36 | 02:42 | — |