Solar flares on August 21, 2001
The most powerful solar flare in 24 hours
M1.5 (strong) flare - August 21 at 5:57 PM
Solar activity index
Value as of the end of the day on August 21, 2001
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from August 20, 2001 to August 21, 2001
Time zone — UTC-04 (Quebec) — summer time
List of solar flares for August 21, 2001
The total number of solar flares of class C and higher — 4 flares
C class — 3 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| M1.5 | 17:51 | 17:57 | 18:00 | — |
| C1.9 | 16:52 | 16:57 | 17:02 | — |
| C2.7 | 06:35 | 09:03 | 10:34 | — |
| C1.6 | 03:21 | 03:48 | 04:13 | — |