Solar flares on July 18, 2004
The most powerful solar flare in 24 hours
M1.9 (strong) flare - July 18 at 1:13 PM
Solar activity index
Value as of the end of the day on July 18, 2004
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from July 17, 2004 to July 18, 2004
Time zone — UTC-04 (Peterborough) — summer time
List of solar flares for July 18, 2004
The total number of solar flares of class C and higher — 16 flares
C class — 15 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C2.1 | 21:58 | 22:08 | 22:11 | — |
| C2.3 | 20:34 | 20:39 | 20:47 | 649 |
| C1.7 | 18:08 | 18:15 | 18:18 | 652 |
| C1.3 | 17:39 | 17:42 | 17:49 | 649 |
| C2.3 | 14:43 | 14:47 | 14:53 | 649 |
| C1.7 | 14:05 | 14:09 | 14:11 | 649 |
| C1.2 | 13:49 | 13:54 | 13:57 | 649 |
| C4.1 | 13:17 | 13:20 | 13:22 | 649 |
| M1.9 | 13:04 | 13:13 | 13:15 | 649 |
| C1.6 | 12:43 | 12:47 | 12:50 | 649 |
| C1.4 | 12:25 | 12:29 | 12:32 | 649 |
| C9.4 | 10:09 | 10:13 | 10:16 | 649 |
| C4.0 | 09:37 | 09:48 | 09:55 | 649 |
| C2.9 | 08:25 | 08:29 | 08:33 | 649 |
| C1.6 | 07:35 | 07:39 | 07:42 | 652 |
| C1.2 | 01:52 | 02:07 | 02:11 | 649 |