|
|||||
|
|
A study on the asymmetries in flare lines |
|
| Authors: | Gan Wei-qun Fang Cheng |
| Institution: | Purple Mountain Observatory, Chinese Academy of Science, China a Astronomy Department, Nanjing University, China b Center of Astronomy and Astrophysics, CCAST World Laboratory, China |
| Abstract: | We calculate the H and CaII K profiles under different velocity models with chromospheric condensations and investigate the effect of the velocity in different layers on the profiles from a semi-empirical standpoint. The results show that the short-time, H blue asymmetry in the early stage of the flare can be caused by condensations in the transition zone, that the subsequent red asymmetry is the result of the downward motion of matter in the upper chromosphere, while the later CaII K asymmetries can be explained by downward velocities of 10–20 km/s in the middle and lower chromosphere. |
| Keywords: | The sun flares chromospheric lines asymmetry |
| 本文献已被 ScienceDirect 等数据库收录！ | |