arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0912.4449astro-ph.SR
收藏

光球通量出射引起的色球磁重联:类喷流事件形成的意义

Chromospheric Magnetic Reconnection caused by Photospheric Flux Emergence: Implications for Jet-like Events Formation

J. Y. Ding, M. S. Madjarska, J. G. Doyle, Q. M. Lu

摘要:

本文研究了低层大气(如色球层)中不同物理环境下的磁重联。它的起源爆炸事件(小尺度喷流)的影响进行了讨论。采用直角坐标系下的2.5维电阻磁流体动力学(MHD)模型。结果表明,磁重联产生的射流的温度和速度强烈地依赖于物理环境,如磁场强度的大小和等离子体密度。如果磁场强度较弱且密度较高,则喷流的温度非常低(~ 10,000 K),速度也非常低(~40 km/s)。然而,如果考虑具有较强磁场强度(20 G)和较小密度(电子密度Ne= 2 × 10 ^{10} cm^{-3})的环境,则流出喷流达到高达600,000 K的较高温度和高达130 km/s的视线速度,这与喷流类事件的观测值相当。

英文摘要:

Magnetic reconnection in the low atmosphere, e.g. chromosphere, is investigated in various physical environments. Its implications for the origination of explosive events (small--scale jets) are discussed. A 2.5-dimensional resistive magnetohydrodynamic (MHD) model in Cartesian coordinates is used. It is found that the temperature and velocity of the outflow jets as a result of magnetic reconnection are strongly dependent on the physical environments, e.g. the magnitude of the magnetic field strength and the plasma density. If the magnetic field strength is weak and the density is high, the temperature of the jets is very low (~10,000 K) as well as its velocity (~40 km/s). However, if environments with stronger magnetic field strength (20 G) and smaller density (electron density Ne=2x10^{10} cm^{-3}) are considered, the outflow jets reach higher temperatures of up to 600,000 K and a line-of-sight velocity of up to 130 km/s which is comparable with the observational values of jet-like events.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑