| Title: |
KINETIC SIMULATION OF SLOW MAGNETOSONIC WAVES AND QUASI-PERIODIC UPFLOWS IN THE SOLAR CORONA |
| Authors: |
Ruan, Wenzhi; He, Jiansen; Zhang, Lei; Vocks, Christian; Marsch, Eckart; Tu, Chuanyi; Peter, Hardi; Wang, Linghua; He, JS (reprint author), Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China.; He, JS (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Beijing 100190, Peoples R China. |
| Publication Year: |
2016 |
| Collection: |
National Space Science Center: NSSC OpenIR (Chinese Academy of Sciences) / 中国科学院国家空间科学中心机构知识库 |
| Subject Terms: |
Sun: Corona; Sun: Oscillations; Waves |
| Description: |
Quasi-periodic disturbances of emission-line parameters are frequently observed in the corona. These disturbances propagate upward along the magnetic field with speeds of similar to 100 km s(-1). This phenomenon has been interpreted as evidence of the propagation of slow magnetosonic waves or has been argued to be a signature of intermittent outflows superposed on the background plasmas. Here we aim to present a new "wave + flow" model to interpret these observations. In our scenario, the oscillatory motion is a slow-mode wave, and the flow is associated with a beam created by the wave-particle interaction owing to Landau resonance. With the help of a kinetic model, we simulate the propagation of slow-mode waves and the generation of beam flows. We find that weak periodic beam flows can be generated by to Landau resonance in the solar corona, and the phase with the strongest blueward asymmetry is ahead of that with the strongest blueshift by about 1/4 period. We also find that the slow wave damps to the level of 1/e after the transit time of two wave periods, owing to Landau damping and Coulomb collisions in our simulation. This damping timescale is similar to that resulting from thermal conduction in the MHD regime. The beam flow is weakened/attenuated with increasing wave period and decreasing wave amplitude since Coulomb collisions become more and more dominant over the wave action. We suggest that this "wave + flow" kinetic model provides an alternative explanation for the observed quasi-periodic propagating perturbations in various parameters in the solar corona. |
| Document Type: |
report |
| Language: |
English |
| Relation: |
ASTROPHYSICAL JOURNAL; http://ir.nssc.ac.cn/handle/122/5674 |
| Availability: |
http://ir.nssc.ac.cn/handle/122/5674 |
| Rights: |
cn.org.cspace.api.content.CopyrightPolicy@1f760e8 |
| Accession Number: |
edsbas.A1746DCD |
| Database: |
BASE |