基于GPS掩星观测的全球偶发E形态学研究  

Research on the global morphological features of sporadic E based on GPS occultation observations

作　　者：周露荣[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》2012年第1期52-56,共5页Journal of Guilin University of Electronic Technology

基　　金：国家自然科学基金(41064003)

摘　　要：利用COSMIC和GRACE系统提供的2009年12月至2010年2月(南半球夏季)、2010年6月至8月(北半球夏季)的GPS掩星观测数据,通过分析电离E层高度范围内C/A码信噪比扰动情况,研究偶发E随地理位置、高度和地方时变化的月平均特征。研究结果表明,较强的信噪比扰动主要出现在距地面90～110km高度范围;在南纬、北纬15°～45°,信噪比扰动有明显的半日变化;在南纬15°至北纬15°,信噪比扰动以周日变化为主。统计结果与已知的全球偶发E形态学特征较一致,说明利用GPS掩星观测技术可以有效地监测全球偶发E的形态学特征。The GPS occultation observation data during the period December 2009 to February 2010（summer in the southern hemisphere） and June to August 2010（summer in the northern hemisphere） provided by COSMIC and GRACE was used to study the global morphological features of sporadic E in terms of the monthly variations with geographical location,altitude and local time（LT） by analyzing C/A code SNR（Signal-to-Noise Ratio） fluctuations at the ionosphere E-region altitudes.The statistical results show that strong SNR fluctuations mainly took place in the altitude range of 90 to 110 km.There are obvious semi-diurnal variations of SNR fluctuations within the 15°-45° latitudinal zones in the southern and northern hemisphere.Moreover,there are mainly diurnal variations in SNR fluctuations within the 15°S-15°N latitudinal zones.The present statistical results are in consistent with the known global morphological features of Sporadic E,which indicates that GPS radio occultation technique is effective to monitor the global morphological features of sporadic E.

关 键 词：偶发E GPS 无线电掩星 

分 类 号：P352.7[天文地球—空间物理学]