Solar flares on March 18, 2003
The most powerful solar flare in 24 hours
X1.5 (very strong) flare - March 18 at 12:08 PM
Solar activity index
Value as of the end of the day on March 18, 2003
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from March 17, 2003 to March 18, 2003
Time zone — UTC+00 (London)
List of solar flares for March 18, 2003
The total number of solar flares of class C and higher — 12 flares
C class — 9 | M class — 2 | X class — 1
| Class | begin | max | end | region |
|---|---|---|---|---|
| C5.1 | 23:08 | 23:28 | 23:41 | 314 |
| C2.9 | 22:41 | 22:54 | 23:03 | — |
| C5.9 | 18:49 | 19:03 | 19:15 | — |
| C1.3 | 16:38 | 16:41 | 16:43 | — |
| C2.8 | 16:12 | 16:20 | 16:27 | 314 |
| X1.5 | 11:51 | 12:08 | 12:20 | 314 |
| C2.4 | 10:09 | 10:23 | 10:39 | — |
| C2.1 | 06:36 | 06:45 | 06:58 | 314 |
| M2.5 | 05:51 | 06:00 | 06:02 | 314 |
| C7.5 | 03:32 | 04:05 | 04:26 | 314 |
| C4.7 | 01:39 | 01:53 | 02:06 | 314 |
| M1.6 | 00:30 | 00:37 | 00:42 | 314 |