Solar flares on July 18, 2004
The most powerful solar flare in 24 hours
M1.9 (strong) flare - July 18 at 2:13 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-03 (Halifax) — 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 | 22:58 | 23:08 | 23:11 | — |
| C2.3 | 21:34 | 21:39 | 21:47 | 649 |
| C1.7 | 19:08 | 19:15 | 19:18 | 652 |
| C1.3 | 18:39 | 18:42 | 18:49 | 649 |
| C2.3 | 15:43 | 15:47 | 15:53 | 649 |
| C1.7 | 15:05 | 15:09 | 15:11 | 649 |
| C1.2 | 14:49 | 14:54 | 14:57 | 649 |
| C4.1 | 14:17 | 14:20 | 14:22 | 649 |
| M1.9 | 14:04 | 14:13 | 14:15 | 649 |
| C1.6 | 13:43 | 13:47 | 13:50 | 649 |
| C1.4 | 13:25 | 13:29 | 13:32 | 649 |
| C9.4 | 11:09 | 11:13 | 11:16 | 649 |
| C4.0 | 10:37 | 10:48 | 10:55 | 649 |
| C2.9 | 09:25 | 09:29 | 09:33 | 649 |
| C1.6 | 08:35 | 08:39 | 08:42 | 652 |
| C1.2 | 02:52 | 03:07 | 03:11 | 649 |