Solar flares on April 21, 2001
The most powerful solar flare in 24 hours
M4.1 (strong) flare - April 21 at 1:34 AM
Solar activity index
Value as of the end of the day on April 21, 2001
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from April 20, 2001 to April 21, 2001
Time zone — UTC+05:30 (Indore)
List of solar flares for April 21, 2001
The total number of solar flares of class C and higher — 7 flares
C class — 6 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.7 | 23:35 | 23:39 | 23:42 | 9433 |
| C2.1 | 22:29 | 22:37 | 22:48 | — |
| C4.8 | 10:09 | 10:18 | 10:38 | — |
| C8.0 | 02:58 | 03:04 | 03:10 | — |
| M4.1 | 01:21 | 01:34 | 01:46 | 9433 |
| C4.0 | 00:35 | 00:46 | 00:52 | 9433 |
| C2.2 | 23:50 | 00:02 | 00:09 | — |