Solar flares on May 21, 2013
The most powerful solar flare in 24 hours
C2.9 (normal) flare - May 21 at 4:37 PM
Solar activity index
Value as of the end of the day on May 21, 2013
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from May 20, 2013 to May 21, 2013
Time zone — UTC-06 (El Paso) — summer time
List of solar flares for May 21, 2013
The total number of solar flares of class C and higher — 8 flares
C class — 8 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.9 | 20:25 | 20:56 | 21:08 | 1745 |
| C2.3 | 18:50 | 18:54 | 18:57 | 1756 |
| C1.1 | 18:23 | 18:27 | 18:30 | 1756 |
| C2.9 | 16:32 | 16:37 | 16:43 | 1756 |
| C1.5 | 16:02 | 16:09 | 16:14 | — |
| C1.0 | 11:32 | 11:37 | 11:40 | 1755 |
| C1.2 | 04:23 | 04:40 | 04:50 | 1745 |
| C1.1 | 01:27 | 01:48 | 01:54 | 1751 |