Solar flares on August 21, 2001
The most powerful solar flare in 24 hours
M1.5 (strong) flare - August 21 at 7:27 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-02:30 (Saint john's) — summer time
List of solar flares for August 21, 2001
The total number of solar flares of class C and higher — 5 flares
C class — 4 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| M1.5 | 19:21 | 19:27 | 19:30 | — |
| C1.9 | 18:22 | 18:27 | 18:32 | — |
| C2.7 | 08:05 | 10:33 | 12:04 | — |
| C1.6 | 04:51 | 05:18 | 05:43 | — |
| C1.9 | 01:01 | 01:07 | 01:16 | — |