磁层顶Kelvin-Helmholtz不稳定性的不对称性研究

磁层顶Kelvin-Helmholtz不稳定性是输运太阳风能量、动量和粒子进入磁层的关键物理机制之一，其不对称性特征是产生输运过程不对称性的主要成因。本项目将利用PPMLR-MHD全球磁流体力学模型研究Parker螺旋场和不同行星际磁场时钟角下的磁层顶K-H不稳定性，定量确定K-H不稳定性激发和演化过程的晨昏不对称性特征；通过对行星际磁场从太阳风到磁层顶的三维演化过程分析，揭示行星际磁场对K-H不稳定性不对称性的控制作用，提升对K-H不稳定性特征及其产生太阳风输运过程的定量认识。

The Kelvin-Helmholtz (K-H) instability at the magnetopause is one of the significant mechanisms to transfer solar wind energy, momentum, and plasma into Earth’s magnetosphere. The asymmetric solar wind transport is mainly due to the asymmetry of the K-H instability. We will use the PPMLR-MHD global simulation model to investigate the K-H instability during interplanetary magnetic field (IMF) conditions of Parker spiral and different clock angles. The spectral analysis method will be applied for quantitative determination of the asymmetry of the excitation and propagation of the K-H instability. The control factor of the IMF on the asymmetry will be revealed from the three-dimensional analysis of the magnetic field from the solar wind to the magnetopause. This study will improve our quantitative understanding of the K-H instability character and the KH-induced solar wind transport.