Solar flares on July 18, 2002
The most powerful solar flare in 24 hours
X1.8 (very strong) flare - July 18 at 3:44 AM
Solar activity index
Value as of the end of the day on July 18, 2002
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from July 17, 2002 to July 18, 2002
Time zone — UTC-04 (Kitchener) — summer time
List of solar flares for July 18, 2002
The total number of solar flares of class C and higher — 12 flares
C class — 11 | M class — 0 | X class — 1
| Class | begin | max | end | region |
|---|---|---|---|---|
| C8.2 | 19:08 | 19:17 | 19:23 | — |
| C1.8 | 18:56 | 19:00 | 19:02 | — |
| C2.6 | 17:43 | 17:52 | 18:01 | — |
| C3.3 | 16:16 | 16:27 | 16:35 | 36 |
| C2.1 | 15:52 | 15:57 | 16:06 | — |
| C1.4 | 13:57 | 14:02 | 14:08 | 35 |
| C1.7 | 13:42 | 13:46 | 13:51 | 30 |
| C5.4 | 09:48 | 09:54 | 10:04 | — |
| C2.7 | 07:51 | 07:58 | 08:06 | 37 |
| C1.6 | 04:15 | 04:35 | 04:40 | 30 |
| X1.8 | 03:24 | 03:44 | 03:49 | 30 |
| C1.7 | 02:49 | 02:53 | 02:57 | 30 |