该文阐述了极光系统混合型激发过程的时域表示及其谱分析方法,着重探讨使用时域递归辅助变量法计算极光参数.与传统的非递归谱估计方法相比较,该文介绍的方法显出它的优越性.经改进后,该算法适用于估算时变参数,因而可以对极光过程的变化进行跟踪研究.利用这种方法对测量所得的极光亮度数据进行处理,结果确定了激发参数变化的存在,并说明了它们随时间变化的过程.“,”The time?domain expression and spectral analysis of the combined direct and indirect excitation process in aurora are described.The technique to evaluate the parameters pertinent to the excitation in aurora with a time?domain recursive instrumental?variables algorithm was studied.The parameters thus determined compare favourably with those evaluated by means of a non?recursive cross?spectral technique.A modification to the algorithm allows the tracking of changes in the excitation mechanism by evaluating pa...