基于GPS无线电掩星观测的偶发E分布特征研究  

The distribution features of sporadic E derived from GPS radio occultation observation

作　　者：廖清[1] 邹玉华[1] 

机构地区：[1]桂林电子科技大学电子工程与自动化学院,广西桂林541004

出　　处：《桂林电子科技大学学报》2013年第1期29-32,82,共5页Journal of Guilin University of Electronic Technology

基　　金：国家自然科学基金(41064003)

摘　　要：为研究全球电离层偶发E(Es)的形态学分布特征,利用COSMIC、GRACE-A和CHAMP掩星观测数据,分析归一化信噪比扰动标准差的全球分布特征。结果表明:归一化信噪比扰动标准差集中在中低纬上空95～110km,在北半球夏季最大,南半球夏季次之,春季和秋季则明显减弱;归一化信噪比扰动标准差的夏季峰值现象十分明显,在北、南半球其最大值均出现在夏至月;南、北半球归一化信噪比扰动标准差的分布特征与地磁场强度水平分量分布特征一致。研究结果与利用其他方法获得的Es观测结果一致,说明利用GPS掩星观测技术可有效监测全球Es的分布特征。In order to study the global morphological features of ionospheric sporadic E （Es）, the data provided by COSMIC, GRACE-A and CHAMP occultation observation systems were used to analyze the global distribution characteristics of the standard deviation of the normalized SNR fluctuations. The results show that larger standard deviations of the normalized SNR fluctuations occur mainly in the altitude range of 95--110 km at low and middle latitude. The values are maximum in summer of the northern hemisphere and larger in summer of the south hemi- sphere, but they decrease significantly in spring and autumn. The summer peak phenomenon for the standard devia- tion of the normalized SNR fluctuations is very obvious, and the maximum values of the standard deviation in the northern and south hemispheres occur in the summer solstice month. The distribution features of the standard devi- ations of the normalized SNR fluctuations in the northern and southern hemispheres agree well with those of the horizontal component of the geomagnetic field intensity. The statistical results are in fair agreement with the previ- ous observations of Es by using other observation methods, which indicates that the global distribution features of Es can be monitored effectively with the GPS radio occultation technique.

关 键 词：偶发E(Es) GPS无线电掩星技术 C A码 信噪比 

分 类 号：P352.7[天文地球—空间物理学]