Solar flares on October 18, 2001
The most powerful solar flare in 24 hours
C8.5 (normal) flare - October 18 at 7:05 PM
Solar activity index
Value as of the end of the day on October 18, 2001
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from October 17, 2001 to October 18, 2001
Time zone — UTC+00
List of solar flares for October 18, 2001
The total number of solar flares of class C and higher — 9 flares
C class — 9 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.0 | 23:37 | 23:44 | 23:48 | 9661 |
| C8.5 | 18:58 | 19:05 | 19:11 | 9672 |
| C4.7 | 16:06 | 16:12 | 16:20 | 9661 |
| C6.5 | 13:46 | 13:49 | 13:52 | 9658 |
| C3.1 | 08:31 | 08:36 | 08:40 | — |
| C3.1 | 05:29 | 05:33 | 05:35 | — |
| C2.3 | 04:23 | 04:26 | 04:29 | — |
| C2.3 | 03:02 | 03:15 | 03:29 | — |
| C2.7 | 01:55 | 01:58 | 02:00 | — |