Solar flares on August 21, 2002
The most powerful solar flare in 24 hours
X1.0 (very strong) flare - August 21 at 9:34 AM
Solar activity index
Value as of the end of the day on August 21, 2002
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from August 20, 2002 to August 21, 2002
Time zone — UTC+04 (Samara)
List of solar flares for August 21, 2002
The total number of solar flares of class C and higher — 16 flares
C class — 13 | M class — 2 | X class — 1
| Class | begin | max | end | region |
|---|---|---|---|---|
| C8.9 | 23:03 | 23:07 | 23:11 | 69 |
| C4.8 | 21:20 | 21:25 | 21:27 | 69 |
| C3.6 | 20:58 | 21:02 | 21:11 | 69 |
| C3.0 | 20:09 | 20:12 | 20:14 | 69 |
| C2.5 | 17:49 | 17:53 | 17:59 | — |
| C3.1 | 16:58 | 17:03 | 17:09 | 69 |
| C3.3 | 16:45 | 16:48 | 16:51 | 69 |
| X1.0 | 09:28 | 09:34 | 09:36 | 69 |
| C3.6 | 08:47 | 08:51 | 08:54 | 83 |
| M1.4 | 05:35 | 05:41 | 05:45 | 69 |
| C3.3 | 04:57 | 05:01 | 05:06 | 69 |
| C6.4 | 03:08 | 03:13 | 03:17 | 69 |
| C5.4 | 02:42 | 02:45 | 02:47 | 69 |
| C6.2 | 02:21 | 02:28 | 02:30 | 69 |
| C3.5 | 02:06 | 02:11 | 02:13 | — |
| M1.2 | 00:53 | 01:14 | 01:24 | 85 |