【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.更多还原

【Abstract】 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(Q_TEC) 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 Q_TEC is（17.7） TECU(1 TECU=10¹⁶ e·m^-2).When local solar zenith angle is larger than 40°,the increase of Q_TEC 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 Q_TEC caused by the solar flares can be determined.Analyzing the spacial variation of Q_TEC,as a result,the spacial variation could be ignored while studying the Q_TEC temporal variation response to the solar flare.更多还原