ELECTROMAGNETIC PROTON/PROTON INSTABILITY AND ITS IMPLICATIONS FOR ION HEATING IN THE EXTENDED FAST SOLAR WIND
ELECTROMAGNETIC PROTON/PROTON INSTABILITY AND ITS IMPLICATIONS FOR ION HEATING IN THE EXTENDED FAST SOLAR WIND
复制标题
DOI：
10.1088/0004-637x/764/1/71
复制
发表时间：
2013-02
期刊：
影响因子：
--
通讯作者：
Xinliang Gao;Q. Lu;Xing Li;L. Shan;Shui Wang
中科院分区：
文献类型：
--
作者：
Xinliang Gao;Q. Lu;Xing Li;L. Shan;Shui Wang
本文采用二维混合模拟方法研究了低β等离子体中质子/质子不稳定性。斜向传播的Alfvén波对质子/质子不稳定性是不稳定的。首先，Alfvén波具有近线性偏振，周围的质子和次离子O6+都可以被共振加热。加热主要在垂直于背景磁场的方向上。随着不稳定性的演化，倾斜传播的Alfvén波逐渐变得左旋极化，从而不能共振加热周围的质子或次要离子O6+。本文还研究了等离子体β和周围质子的温度各向异性对不稳定性演化的影响。最后，讨论了我们的模拟结果对扩展的快速太阳风中离子加热的影响。
Two-dimensional hybrid simulations are performed in this paper to investigate the proton/proton instability in low beta plasma. The obliquely propagating Alfvén waves are found to be unstable to the proton/proton instability. At first, the Alfvén waves have a nearly linear polarization, and both the ambient protons and minor ions O6+ can be resonantly heated. The heating is primarily in the direction perpendicular to the background magnetic field. With the evolution of the instability, the obliquely propagating Alfvén waves gradually become left-hand polarized, and then cannot resonantly heat the ambient protons or minor ions O6+. The effects of the plasma beta and temperature anisotropy of the ambient protons on the evolution of the instability are also studied in this paper. Finally, the implications of our simulation results for ion heating in the extended fast solar wind are discussed.