Solar flares on July 21, 2004
The most powerful solar flare in 24 hours
M9.1 (strong) flare - July 21 at 8:32 PM
Solar activity index
Value as of the end of the day on July 21, 2004
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from July 20, 2004 to July 21, 2004
Time zone — UTC-04 (Kitchener) — summer time
List of solar flares for July 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 |
|---|---|---|---|---|
| M9.1 | 20:14 | 20:32 | 20:43 | 652 |
| C8.9 | 01:05 | 01:21 | 01:33 | 652 |