Solar flares on April 21, 2004
The most powerful solar flare in 24 hours
M1.2 (strong) flare - April 21 at 8:19 PM
Solar activity index
Value as of the end of the day on April 21, 2004
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from April 20, 2004 to April 21, 2004
Time zone — UTC-06 (Yellowknife) — summer time
List of solar flares for April 21, 2004
The total number of solar flares of class C and higher — 2 flares
C class — 1 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| M1.2 | 20:03 | 20:19 | 20:24 | 596 |
| C1.8 | 10:01 | 10:15 | 10:36 | 596 |