摘要
发生在2009年7月22日亚太地区的日全食,为人们研究电离层扰动提供了一次难得的机会.基于沙洋地区采集的高频(1Hz)GPS数据,通过对日食当天与前后几天电离层VTEC(Vertical Total Electron Content)的变化分析,结果显示日食期间电离层VTEC含量均呈现出一种先下降再上升的"水槽"变化趋势,且VTEC下降达到2～5TECU,下降幅度达33.1%,VTEC的最小值与食甚时刻延迟为25.2～147.6s.在日全食后期有中等强度的磁暴发生,与日食相互重合叠加共同对电离层VTEC变化造成影响,使得VTEC变化明显异于前后几天,最后定量的分析了磁暴对VTEC的影响.
The total solar eclipse, which occurred in the Asian-Pacific region on 22 July 2009, provides a rare opportunity for studying ionospheric disturbance. The paper studies the variation of VTEC（Vertical Total Electron Content） by using 1HZ GPS data which collected from Shayang area among a few days before and after the eclipse day. We consider the Instrument Bias （IB） in our data processing, meanwhile we use the polynomial model in regional ionospheric model to make our results more reliable. The trough-like variation with a gradual decrease and followed by an increase of VTEC during the total solar eclipse were observed form our analyses. Depression of VTEC amounted to 2~5 TECU, which has a decrease of 33. 1%. The delay of a minimum level of VTEC with respect to the maximum phase of eclipse was 25. 2 ~ 147. 6 s. The results obtained in this study are in good agreement with earlier measurements and theoretical estimates. In the late of the eclipse, there was a medium magnetic storm emerged, which overlapped with the eclipse affected the variation of VTEC. The variation of VTEC in the eclipse days were obvious unusual compared to the reference days. At last, this paper quantitative analyzes the influence of magnetic storm to VTEC.
出处
《地球物理学进展》
CSCD
北大核心
2013年第4期1646-1654,共9页
Progress in Geophysics
基金
国家自然科学基金(0811291029)资助
关键词
日全食
垂直总电子含量
电离层扰动
磁暴
total solar eclipse, VTEC, ionospheric disturbance, magnetic storm
