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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。本文用西南极地区的GPS跟踪站数据和测高卫星Jason-2数据,分别提取了陆地和海洋地区大范围的电离层TEC参数。GPS反演结果的优势是获取测站上空高精度的TEC时间序列,测高反演的结果整体与GPS的结果精度相当,虽然测高的时间分辨率较低,但其优势是获取海洋广大区域的TEC值。两种观测手段的研究区域互补,可以充分观测威德尔海异常在西南极的变化特征,从空间上来看,威德尔海异常出现在以别林斯高晋海为中心的广大区域,而威德尔海异常也是覆盖了西南极的别林斯高晋海、威德尔海以及可达80°S的西南极陆地区域。从时间上来看,出现时段在每年的10月底到次年3月初,夜晚电子密度增加,白天电子密度降低,随着太阳活动的增强,其异常程度也变大。
The Weddell Sea anomaly is an ionospheric anomaly that occurs in the summer in the southwest Antarctic coastal area. In this paper, a large range of ionospheric TEC parameters are extracted from terrestrial and oceanic regions using GPS tracking station data and Jason-2 data of altimetric satellites. The advantage of GPS inversion results is the acquisition of high-precision TEC time series over the stations. The results of altimetry inversion are quite similar to those of GPS. Although the lower temporal resolution of altimetry, The TEC value. The study areas of the two observation methods are complementary to each other, and the variations of the Weddell Sea anomaly in the SW can be fully observed. From the perspective of space, the Weddell Sea anomaly occurs in a wide area mainly centered on the Belinsky Jinhai Sea, while the Weddell Sea anomaly It also covers the Belinsk Jinhai, the Weddell Sea and the Southwest Antarctic land areas up to 80 ° S in the southwest. From the time point of view, the appearance time is from the end of October to the beginning of March each year. The electron density increases at night and the electron density decreases during the daytime. As the solar activity increases, the anomaly degree also increases.