Solar flares on September 21, 2002
The most powerful solar flare in 24 hours
C3.0 (normal) flare - September 21 at 12:50 AM
Solar activity index
Value as of the end of the day on September 21, 2002
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 20, 2002 to September 21, 2002
Time zone — UTC-02:30 (Saint john's) — summer time
List of solar flares for September 21, 2002
The total number of solar flares of class C and higher — 7 flares
C class — 7 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.7 | 20:30 | 20:37 | 20:43 | — |
| C2.6 | 18:04 | 18:30 | 19:08 | 123 |
| C2.6 | 14:26 | 14:33 | 14:40 | 119 |
| C1.1 | 12:25 | 12:29 | 12:33 | — |
| C1.5 | 05:25 | 05:29 | 05:41 | — |
| C2.4 | 01:05 | 01:08 | 01:11 | — |
| C3.0 | 00:42 | 00:50 | 00:56 | 121 |