磁扰期间等离子体层典型结构的动力学形成机制研究

Plasmasphere is one important part of the inner magnetosphere.Current studies focus on the whole sturcture、morphology and dynamics evolution during a geomagnetic disturbance.This project aims to reveal the dynamics formation machanism of the typical sturctures,study the rapid erosion process and obtain a reasonable explaination for the plasmaspause's structure and types during the geomagnetic disturbance. The "test particles" three-dimentional simulation on the typical structures of the plasmasphere is carried out based on particle dynamics method by using Weimer and T96 model during a geomagnetic disturbance.The dynamics evolution is discussed.The exploration on a new location for particles to escape is done. The results of the simulations compare with the structures of plasmaspause, like plumes, shoulders and channels, which were observed by EUV on IMAGE satellite. This work may lay a theoretical foundation for the magnetosphere dynamics research and provide theoretical support for data analysis of Moon-based and "KuaFu" EUV imaging, which is to be realized on the Chang'e-3 mission in the Second Phase of Chinese Lunar Exploration Program and KuaFu mission.

磁扰期间等离子体层整体结构及动力学变化是当前内磁层物理研究的前沿课题之一。本项目拟采用Weimer电场和T96磁场模型，基于粒子动力学方法，通过"试验粒子"开展等离子体层典型结构的三维动力学模拟，研究磁扰期间等离子体层的动力学响应及其演变过程，探索粒子逃逸的新位置，并将计算结果与IMAGE/EUV 成像图像进行比较，旨在揭示磁扰期间等离子体层典型扰动结构的动力学形成机制，研究磁扰期间内磁层等离子体层的快速剥蚀过程，以期能获得等离子体层顶结构和类型的理论解释，为磁层整体系统的动力学研究奠定理论基础，并为即将开展的"嫦娥三号"月基和"夸父"计划地球等离子体层EUV成像探测的数据分析研究提供理论支持。

地球等离子体层典型结构的形成机制尚不明确。本项目基于卫星观测资料分析和试验粒子数值模拟，研究了磁扰期间等离子体层的典型结构及其形成机制。通过IMAGE-EUV观测数据，研究对比了极端地磁扰动下等离子体层的演变过程，发现了指状结构，分析了指状结构出现及演变的规律。采用Weimer电场+T04磁场，基于单粒子轨道法，模拟了肩状结构、羽状结构和通道状结构的动力学演变过程，并探讨了其形成机制。采用Weimer电场+T04磁场，模拟了极端地磁扰动下等离子体层的动力学演变过程，发现了一种特殊的演变过程，特别是在演变后期，等离子体层呈现出扇形、蝶翼状结构，进一步探索了伴随该典型结构演变的地球物理参数和可能的诱发机制。本项研究有助于对内磁层动力学的再认识和理解。