First X-Class Solar Flares of 2013 – NASA
On May 12-13 the Sun erupted with an X1.7-class and an X2.8-class flare as well as two coronal mass ejections, or CMEs. Solar flares are classified as A, B, C, M or X according to the peak flux.
httpv://youtu.be/ywfewbzmvrw
| Classification | Peak Flux Range at 100-800 picometre |
|---|---|
| (Watts/square metre) | |
| A | < 10−7 |
| B | 10−7 – 10−6 |
| C | 10−6 – 10−5 |
| M | 10−5 – 10−4 |
| X | > 10−4 |
