【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.更多还原

【Abstract】 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.更多还原