磁暴期间电离层扰动的GPS台网观测分析  

AN ANALYSIS OF THE IONOSPHERIC DISTURBANCES DURING A MAGNETIC STORM OBSERVED WITH A GPS NETWORK

作　　者：夏淳亮[1] 万卫星[1] 袁洪[2] 余涛[3] 

机构地区：[1]中国科学院地质与地球物理研究所 [2]中国科学院软件研究所 [3]中国气象局国家卫星气象中心

出　　处：《空间科学学报》2004年第5期326-332,共7页Chinese Journal of Space Science

基　　金：国家自然科学基金项目(49974039);国家重点基础研究基金项目(G2000078407)共同资助

摘　　要：给出了一种利用GPS台网观测获取TEC快速变化的计算方法,并将该方法用于东亚-澳大利亚扇区的GPS台网观测数据,分析了2000年7月14-18日大磁暴期间的电离层响应,揭示出电离层暴期间赤道异常峰的压缩和移动等特性.计算结果表明,在站点分布不均匀、原始观测数据不足且随时间跳变等多种不利因素的影响下,这种新的算法仍能保持很好的计算稳定性,并能快速地提取给定时空范围内的三维TEC短时变化的特征,适用于研究电离层暴等情况下引起的TEC扰动.With a GPS network located in the East Asia and Australia sector, a anal-ysis method to estimate the rapid variation of TEC is proposed and applied to the investigation of the ionospheric responses to the July 14-18, 2000 geomag-netic storm. The analyzed result reveals the perturbation structure around the geomagnetic equator during the storm. The temporal and spatial changes of TEC are obtained and discussed. The results manifest most of the information of the storm-time regional TEC variation in spite of the disadvantageous influences, such as the asymmetrical distribution of the GPS network, the shortfall of observation data, the discontinuous variety of data and etc. It is shown that the method we used is satisfactory in studying the small scale ionospheric disturbance such as the perturbations during ionospheric storms.

关 键 词：电离层暴 GPS 台网观测 电离层扰动 电离层电子浓度总含量 

分 类 号：P228.4[天文地球—大地测量学与测量工程] P352.4[天文地球—测绘科学与技术]