Theory and Simulation of Ionosphere-Magnestosphere Coupling Dynamics

9224549 Seyler将研究三个独立但相关的主题，涉及磁层-电离层系统的小尺度和中尺度现象，以及它们在调节极光区的耦合、能量学和动力学方面所起的作用。 第一个专题是利用过去四年来改进的三维模拟模型探索极光弧的中小尺度结构。 第二个主题涉及电子通过波过程的极光加速，包括阿尔芬波加速和通过极光千米辐射（AKR）的参数衰减加速。 最近的探空火箭观测（黄玉I，II和III）发现了与强烈的低混合波包相关的横向离子加速事件。 第三个调查专题将探讨极光电离层上层低杂波现象的特征。 我们目前有在我们的处置三维低混合波的非线性模拟模型，我们将使用探空火箭观测比较，以及测试低混合崩溃和相关的横向离子加速的理论。 ***

9224549 Seyler Three separate, but related topics will be investigated concerned with small and intermediate scale phenomena of the magnetosphere- ionosphere system and the role that they play in mediating the coupling, energetics and dynamics of the auroral zone. The first topic is an exploration of the small and intermediate scale structure of auroral arcs using a three-dimensional simulation model that has been refined over the past four years. The second subject is concerned with the auroral acceleration of electrons through wave processes, including Alfven wave acceleration and acceleration through the parametric decay of auroral kilometric radiation (AKR). Recent sounding rocket observations (TOPAZ I, II and III) have found tranverse ion acceleration events associated with intense lower-hybrid wave packets. The third topic of inquiry will explore the characteristics of lower-hybrid wave phenomena in the upper auroral ionosphere. We presently have at our disposal three-dimensional nonlinear simulation models for lower-hybrid waves which we will use to compare to sounding rocket observations as well as to test the theories of lower-hybrid collapse and the associated transverse ion acceleration. ***