Simulation of Current Driven Electrostatic Instabilities on Auroral Field Lines

新开发的电流驱动双层(CUDDL)程序将用于研究与极光场线上的电流驱动过程有关的一些悬而未决的问题。该程序包括向上和向下传播的斜切变阿尔芬波。将模拟与极光场线过程有关的物理参数，包括等离子体、电流密度和磁场的大小和空间变化。这些新的运行将使分析理论所建议的标度定律的测试成为可能，并提供对孤子和双层形成、电流丝化、电子加速和加热等过程的物理更深入的了解。还将研究平行于磁场的密度梯度的作用，确保不稳定的临界电流存在于模拟系统中。

The newly developed Current Driven Double Layer (CUDDL) code will be used to investigate a number of outstanding questions relating to current driven processes on auroral field lines. The code includes upward and downward propagating oblique shear Alfven waves. Physical parameters relevant to auroral field line proceses will be modeled, including the magnitude and spatial variation of plasma and current density and magnetic field. These new runs will enable tests of scaling laws suggested by analytic theory and provide more insight into the physics of processes such as soliton and double layer formation, current filamentation, electron acceleration and heating. The role of density gradients parallel to the magnetic field will also be studied, making sure that the critical current for instabilities lies in the simulation system.