基于COSMIC掩星观测的顶部电离层标高特征分析  

Characterization of topside ionospheric scale height based on COSMIC occultation observations

作　　者：韩超 庞岗 靳睿敏 甄卫民[2] 王丹丹 马雪纯 朱庆林[2] 陈龙江 陈丽[2] 白培瑞 HAN Chao;PANG Gang;JIN Ruimin;ZHEN Weimin;WANG Dandan;MA Xuechun;ZHU Qinglin;CHEN Longjiang;CHEN Li;BAI Peirui(College of Electronic Information Engineering,Shandong University of Science and Technology,Qingdao 266590,China;China Research Institute of Radiowave Propagation,Qingdao 266107,China)

机构地区：[1]山东科技大学电子信息工程学院,青岛266590 [2]中国电波传播研究所,青岛266107

出　　处：《电波科学学报》2024年第2期253-261,共9页Chinese Journal of Radio Science

基　　金：国家重点研发计划(2022YFF0503900);国家自然科学基金(62201326);山东省自然科学基金(ZR2022QF056)。

摘　　要：顶部电离层是指F2层电子密度最大值所在高度以上的电离层区域。掩星观测能够提供地面到低轨卫星轨道高度处的整个电离层电子密度剖面,对于顶部电离层的研究具有重要作用。标高是构建顶部以上电离层电子密度剖面模型的重要参数。本文使用2007—2020年的气象、电离层和气候星座观测系统(Constellation Observing System for Meteorology,Ionosphere and Climate,COSMIC)掩星观测数据,提取有效电子密度剖面数据的顶部标高,分析了其随地方时、季节、经纬度和太阳活动水平的变化特性。结果表明:顶部标高具有明显的日变化和季节变化规律,并且表现出强烈的太阳活动依赖性;顶部标高在纬度上的变化强烈依赖于地方时,同时在东西经向上表现出明显的波状结构,且这种经度波状结构在南北半球具有不同的形态;顶部标高在夏季半球具有显著的东西经向差异,南半球夏季更为明显。The topside ionosphere is the region of the ionosphere above the altitude where the F2 layer electron density maximum is located.Occultation observations can provide the entire ionospheric electron density profile from the ground to the orbital altitude of LEO satellites,which is important for the study of the topside ionosphere.The topside scale height is an important parameter for the construction of the ionospheric electron density profile model above the top.In this paper,we extract the top scale height of the effective electron density profile data using the constellation observing system for meteorology,ionosphere and climate(COSMIC)occultation observations from 2007 to 2020,analyze its characteristics with local time,season,latitude,longitude,and solar activity level.The results show that:the topside scale height has obvious daily and seasonal variation patterns and shows strong dependence on solar activity;the latitudinal variation of the topside scale height is strongly dependent on the local time and shows a distinct wave structure in the east-west longitude direction,which has different morphologies in the northern and southern hemispheres;the topside scale height has a significant east-west longitudinal difference in the summer hemisphere,more pronounced in the southern hemisphere in summer.

关 键 词：COSMIC掩星 顶部电离层 电子密度剖面 太阳活动 标高 

分 类 号：P352[天文地球—空间物理学]