Numerical Studies of Magnetospheric Dynamics and Related Space Plasma Processes

这个建议是为了磁层的数值研究 重点是中间冲击波的性质， 磁鞘和磁层顶的动力学，重联和 地磁尾的对流和极光电子 低混合波湍流加速。 标度行为 中间的冲击将通过磁流体动力学来处理 (MHD)接着是扩展到高离子β的混合模拟 情况（β是等离子体与场能量密度的比率）。MHD 对磁层顶的研究将沿着与混合 模型来研究磁层顶结构。 3D全球模拟将 包括磁层的所有大尺度动力学 测试磁鞘和磁层顶边界的影响 条件 磁层对这些输入的响应将是 通过对近距离无碰撞重联的研究进行了分析， 地球等离子体片，扩展到包括更一般的方面， 对流和考虑结构和稳定性的更多 尾电流片的远处部分。 新的高β漂移- 将开发动力学模拟代码，包括一些动力学 对电子和离子的影响。 此代码将用于 为了验证电子轨道的混沌化可以 恢复普遍的离子撕裂模式-一个基本的问题， 空间等离子体的重联过程 共振电子 加速离子波湍流将研究和结果 与极光电子谱观测结果相比， 极光弧的结构。

This proposal is for numerical studies of the magnetosphere with a focus on the properties of intermediate shock waves, the dynamics of the magnetosheath and magnetopause, reconnection and convection in the geomagnetic tail, and auroral electron acceleration by lower-hybrid wave turbulence. Scaling behavior of intermediate shocks will be handled through magnetohydrodynamics (MHD) followed by hybrid simulations extended to the high ion beta case (beta is the ratio of plasma to field energy density). MHD studies of the magnetopause will be pursued along with hybrid models to study magnetopause structure. 3D global simulations will be done including all the large-scale dynamics of the magnetosphere to test the effects of magnetosheath and magnetopause boundary conditions. Response of the magnetosphere to these inputs will be analyzed through studies of collisionless reconnection in the near- Earth plasma sheet, extended to cover more general aspects of convection and to consider the structure and stability of more distant parts of the tail current sheet. A new high beta drift- kinetic simulation code will be developed including some kinetic effects for the electrons as well as ions. This code will be used to test the hypothesis that chaotization of electron orbits can restore the universal ion tearing mode - a fundamental question for the reconnection process in space plasmas. Resonant electron acceleration by ion wave turbulence will be studied and the results compared with observations of auroral electron spectra and the structure of auroral arcs.