Solar flares on May 21, 2004
The most powerful solar flare in 24 hours
M2.6 (strong) flare - May 21 at 3:52 PM
Solar activity index
Value as of the end of the day on May 21, 2004
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from May 20, 2004 to May 21, 2004
Time zone — UTC-08 (Anchorage) — summer time
List of solar flares for May 21, 2004
The total number of solar flares of class C and higher — 5 flares
C class — 4 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C2.2 | 23:02 | 23:12 | 23:19 | 618 |
| C1.7 | 17:16 | 17:19 | 17:23 | — |
| M2.6 | 15:35 | 15:52 | 15:59 | 618 |
| C1.2 | 14:13 | 14:20 | 14:29 | 615 |
| C2.0 | 08:16 | 08:23 | 08:28 | 617 |