南极电离层特征的球冠谐分析  

Characteristics of the Antarctic ionosphere by utilizing spherical cap harmonic analysis

作　　者：王泽民[1] 王康 李航[1] 孙伟[1,2] 安家春 WANG Zemin;WANG Kang;LI Hang;SUN Wei;AN Jiachun(Chinese Antarctic Cen-ter of Surveying and Mapping,Wuhan University,Wuhan 430079,China;Wuhan Geomatics Institute,Wuhan 430022,China)

机构地区：[1]武汉大学中国南极测绘研究中心,武汉430079 [2]武汉市测绘研究院,武汉430022

出　　处：《测绘科学》2018年第10期33-38,共6页Science of Surveying and Mapping

基　　金：国家自然科学基金项目(41776195);南北极环境综合考察与评估专项基金项目(CHINARE2017-02-02)

摘　　要：针对国际GNSS服务(IGS)各电离层分析中心发布的全球电离层图(GIM)在南极地区精度有限的问题,该文在收集IGS、极地对地观测网络(POLENET)计划和中国南极测绘研究中心(CACSM)的GPS数据的基础上,采用球冠谐分析理论建立了南极地区电离层电子总含量(TEC)模型。通过球冠谐分析的零阶项系数表示的日均值与实测TEC日均值的对比,表明二者具有很强相关性,验证了球冠谐分析具有良好的物理意义,可以有效提取南极电离层的周期特征。利用球冠谐函数模型对全南极电离层在2012年季节变化、空间分布和10月地磁暴期间的响应特征进行了分析。实验结果表明,基于球冠谐分析构建的电离层模型更适用于探测南极电离层的特征。Aiming at the problem that the global ionosphere maps（GIM）released by the International GNSS Service（IGS）Ionospheric Analysis Center has limited accuracy in the Antarctic region,this paper put forward a method of collecting IGS,the polar earth observing network（POLENET）and Chinese Antarctic Center of Surveying and Mapping（CACSM）GPS data and using spherical cap harmonic analysis theory to establish Antarctic ionosphere total electron content（TEC）model.The daily mean of the zero-order coefficient of the spherical cap harmonic analysis was strongly correlated with the measured daily mean TEC,which verified that the spherical cap harmonic analysis had good physical meaning and could effectively extract the periodic characteristics of the Antarctic ionosphere.Based on the spherical harmonic model,the response characteristics of the whole Antarctic ionosphere during the seasonal variation,spatial distribution and geomagnetic storms in October were analyzed.The experimental results showed that spherical cap harmonic analysis of the ionospheric model constructed more suitable for feature detection Antarctic ionosphere.

关 键 词：球冠谐模型 南极电离层 电子总含量 电离层暴 

分 类 号：P228.4[天文地球—大地测量学与测量工程]