Solar flares on April 21, 2004
The most powerful solar flare in 24 hours
C2.1 (normal) flare - April 21 at 5:58 AM
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+03 (Arkhangelsk)
List of solar flares for April 21, 2004
The total number of solar flares of class C and higher — 2 flares
C class — 2 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.8 | 19:01 | 19:15 | 19:36 | 596 |
| C2.1 | 05:40 | 05:58 | 06:21 | 596 |