摘要
本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，本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 timedomain 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 timedomain recursive instrumentalvariables algorithm was studied.The parameters thus determined compare favourably with those evaluated by means of a nonrecursive crossspectral technique.A modification to the algorithm allows the tracking of changes in the excitation mechanism by evaluating parameters which vary in time.Processing of real auroral photometric measurements with this method has established the existence of such changes and demonstrated their time history.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
1998年第4期394-398,共5页
Spectroscopy and Spectral Analysis
关键词
辅助变量法
递归
时域
极光
参数
激发参数
Instrumentalvariables algorithm, Recursive, Timedomain, Aurora, Parameter
