日侧分立极光的加速机制研究

Based on the previous investigation of the morphologic classification of dayside discrete auroras, we will systematically study the acceleration mechanisms of dayside discrete aurora through analyzing the long-term observation data of multiple-wavelength auroral imagers acquired from Zhongshan station and South Pole station in Antarctica and Yellow River station and KHO station in Arctic, and the satellite data from ionospheric satellites (e.g., DMSP, REIMEI) and magnetospheric satellites (e.g., MMS, Cluster, THEMIS, Polar, IMAGE). Using the joint observation between the satellite and ground-based aurora imagers, we will study the characteristics of particle precipitation of different dayside discrete auroral forms, e.g., the electric precipitating, the convection, and the characteristics of all kinds of dynamic parameters in the acceleration regions, such as the variation and distribution of electric field, magnetic field, and particle density. Based on the existing acceleration models of particle precipitation, we will find the key physical parameters which can affect the auroral morphology in the particle acceleration, and the potential acceleration mechanisms for every dayside discrete auroral form. Moreover, the response in the particle acceleration will be investigated when the circumstance characteristics of the source region of precipitating particle in the magnetosphere and the emission region of dayside discrete aurora in the ionosphere are changed.

本课题在日侧分立极光形态分类的工作基础上，利用我国在南极中山站、北极黄河站、以及美国南极极点站、挪威北极KHO观测站的地面多波段极光成像系统的长期观测资料，结合国际上的电离层卫星（REIMEI、DMSP）、磁层卫星（MMS、Cluster、THEMIS、Polar、IMAGE）系统开展日侧典型分立极光的加速机制研究。利用卫星与地面极光观测设备开展联合观测，详细研究各类日侧分立极光的粒子沉降特性，如电子沉降能谱特征、对流特征，以及加速区的各类动力学参数特性，如电场、磁场、粒子的变化和空间分布等；结合已有的粒子加速机制理论模型，确定粒子加速过程中决定极光形态变化的物理量，探讨日侧极光典型形态的加速机制；并对极光沉降粒子磁层源区和电离层极光激发区的特性变化对粒子加速过程的影响进行探讨。

本课题在日侧分立极光形态分类的工作基础上，利用我国在南极中山站、北极黄河站、以及美国南极极点站、挪威北极KHO观测站的地面多波段极光成像系统的长期观测资料，结合国际上的电离层卫星（REIMEI、DMSP）、磁层卫星（MMS、Cluster、THEMIS、Polar、IMAGE）系统开展日侧典型分立极光的加速机制研究。利用卫星与地面极光观测设备开展联合观测，详细研究各类日侧分立极光的粒子沉降特性，如电子沉降能谱特征、对流特征，以及加速区的各类动力学参数特性，如电场、磁场、粒子的变化和空间分布等；结合已有的粒子加速机制理论模型，确定粒子加速过程中决定极光形态变化的物理量，探讨日侧极光典型形态的加速机制；并对极光沉降粒子磁层源区和电离层极光激发区的特性变化对粒子加速过程的影响进行探讨。