电离层对耀斑响应的GPS观测分析  

Analysis of the Ionosphere Response to the Solar Flare by GPS Observation

作　　者：沈韡[1] 袁志刚[1] 邓晓华[1] 李世友[1] 刘琨[1] 唐荣欣[1] 

机构地区：[1]武汉大学电子信息学院,湖北武汉430072

出　　处：《武汉大学学报（理学版）》2006年第3期375-379,共5页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金(40574073;40574074;40390152);国家杰出青年基金(40325012);中国博士后科学基金;长江学者特聘教授基金资助项目

摘　　要：利用全球定位系统(GPS)台网数据,研究了耀斑爆发期间电离层总电子含量(QTEC)的突然增强(SITEC)现象.基于GPS差分群时延和差分载波相位联合数据处理方法,利用双频的GPS数据计算了2003年10月28日大耀斑期间各GPS台站QTEC,其最大增量达到17.7 TECU(1 TECU=1016e.m-2).结果表明,当观测点太阳天顶角>40°时,QTEC增量与观测点太阳天顶角成线性反比例关系,对这种关系进行拟合,确定了反比例系数.进而与2003年10月29日和11月4日两次耀斑事件进行了比较,可以确定上述反比例系数与耀斑对电离层的影响程度有关.同时对QTEC的时空变化问题进行了定量分析,证实了对于耀斑事件,可以忽略GPS卫星的空间变化对QTEC随时间变化的影响.The data from the International GPS （global positioning system） Service （IGS） are used to investigate the characteristics of the sudden increase of the ionospheric total electron content （QTEC） response to the solar flare. Based on the methods of differential time delay and differential phase advance, research on the solar flare occurring on Oct. 28, 2003 indicated that the largest increase of the QTEC is 17. 7 TECU （1 TECU=10^16 e·m^- 2）. When local solar zenith angle is larger than 40°, the increase of QTEC has inversely-proportional relationship to the solar zenith angle. The inversely proportional coefficient can be got by fitting. Compared with the solar flares on Oct. 29, 2003 and Nov. 4, 2003, the relationship between the inversely proportional coefficient and the increase of QTEC caused by the solar flares can be determined. Analyzing the spacial variation of QTEC, as a result, the spacial variation could be ignored while studying the QTEC temporal variation response to the solar flare.

关 键 词：耀斑 总电子含量 全球定位系统 太阳天顶角 

分 类 号：P352[天文地球—空间物理学]