Solar flares on July 21, 2002
The most powerful solar flare in 24 hours
X3.3 (very strong) flare - July 21 at 4:30 AM
Solar activity index
Value as of the end of the day on July 21, 2002
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from July 20, 2002 to July 21, 2002
Time zone — UTC+07 (Norilsk)
List of solar flares for July 21, 2002
The total number of solar flares of class C and higher — 6 flares
C class — 5 | M class — 0 | X class — 1
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.4 | 21:14 | 21:21 | 21:31 | — |
| C1.8 | 20:33 | 20:37 | 20:39 | 35 |
| C6.7 | 14:35 | 14:45 | 14:54 | — |
| C6.7 | 13:05 | 13:13 | 13:24 | — |
| C7.9 | 10:07 | 10:10 | 10:12 | — |
| X3.3 | 04:04 | 04:30 | 04:54 | — |