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威德尔海异常是西南极沿海地区在夏季出现的电离层异常现象,以子夜时电子密度增强为主要特征.于1958年首次观测发现,但囿于观测手段的限制,其研究进展缓慢.2003年,有学者利用TOPEX卫星分析了大范围的威德尔海异常,随后关于威德尔海异常的研究重新兴起.与COSMIC和TOPEX等的结果相比,地基GPS最大的优点是提供连续时间尺度的观测结果.本文用地基GPS数据提取了威德尔海异常,进而分析其时空特征.这一异常在太阳活动活跃期表现出了更为明显的特征.其覆盖范围包括了威德尔海、别林斯高晋海和南美南端的广大区域,且出现的时刻比较一致,说明这一异常特征是在短时间内大范围出现的.在春夏交替的时刻会出现双峰现象,在夏季时,地方时正午的TEC值反而会比春夏交替时的TEC值更低.
The Wedell Sea anomalies are the ionospheric anomalies that occur in the summer in the Southwest Antarctic and are mainly characterized by the enhanced electron density in the middle of the night. The first observation in 1958 found that the study was slow in the limit of observation methods. , Some scholars use TOPEX satellite to analyze a wide range of Weddell Sea anomalies and then revive the study of Weddell Sea anomalies.Compared with the results of COSMIC and TOPEX etc., the biggest advantage of ground-based GPS is to provide continuous time-scale observations In this paper, we use the ground-based GPS data to extract the Weddell Sea anomaly, and then analyze its spatio-temporal features, which show more obvious features during the solar active period.The coverage includes Weddell Sea, Belinsk Jinhai and The vast area at the southern tip of South America appears more consistent, indicating that this anomaly is in a wide range of short-term emergence of a double peak at the turn of the spring and summer, the summer when the local time noon TEC value But will be lower than the value of TEC when the spring and summer alternating.