北京地区电离层COSMIC掩星与垂测仪探测临界频率数据对比  

Comparison of foF2 data obtained by ionosonde observation and COSMIC ionospheric occultation over Beijing

作　　者：马新欣[1] 刘晓灿[1] 焦立果[1] Ma Xinxin;Liu Xiaocan;Jiao Liguo(Institute of Geophysics, China Earthquake Administration, Beijing Municipality 100081, China)

机构地区：[1]中国地震局地球物理研究所,中国北京100081

出　　处：《地震地磁观测与研究》2017年第3期76-80,共5页Seismological and Geomagnetic Observation and Research

基　　金：中央公益性科研院所基本科研业务(项目编号:No.DQJB16B08)

摘　　要：使用COSMIC掩星和垂测仪,探测2011—2012年北京地区电离层临界频率数据,比较不同探测手段获取的电离层特征参量随地方时和地磁季节相关性的变化。研究表明:2组数据具有较好的相关性;标准偏差随地方时变化,日出时6:00 LT开始增大,日落时16:00LT到次高值,19:00LT达最大值后开始下降;标准偏差随地磁季节变化,夏季最小,冬季最大。分析认为,电子密度在垂直和水平方向上的梯度变化,造成掩星反演误差增大,可能导致了数据相关性在不同地磁季节和地方时刻的相应变化。In this paper,foF2data obtained by COSMIC radio occultation is compared to Beijing ionosonde observation station during2years from January2011to December2012.The correlation coefficient and the standard deviation of the observation data obtained by two techniques are calculated and the variations of foF2difference with local time and geomagnetic season are analyzed.The results show that the correlation of foF2is good.The standard deviation of foF2begins to increase from local time of6:00at sunrise.It reaches the second peak at local time of16:00at sunset.It reaches the highest at local time of19:00and then begins to decrease.The standard deviation of foF2is lower in the geomagnetic summer and is larger in the geomagnetic winter.The gradient of the electron density in the vertical and horizontal directions may increase the error of occultation inversion,which may lead to the corresponding changes of the data correlation in different geomagnetic seasons and local time.

关 键 词：临界频率 COSMIC 垂测仪 对比 

分 类 号：P352.7[天文地球—空间物理学]