Solar flares on July 21, 2002
The most powerful solar flare in 24 hours
C7.9 (normal) flare - July 21 at 12:40 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-02:30 (Saint john's) — summer time
List of solar flares for July 21, 2002
The total number of solar flares of class C and higher — 5 flares
C class — 5 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.4 | 11:44 | 11:51 | 12:01 | — |
| C1.8 | 11:03 | 11:07 | 11:09 | 35 |
| C6.7 | 05:05 | 05:15 | 05:24 | — |
| C6.7 | 03:35 | 03:43 | 03:54 | — |
| C7.9 | 00:37 | 00:40 | 00:42 | — |