基于COSMIC-1无线电掩星的电子密度模型构建及其特性分析  

Construction and characteristic analysis of the electron density model based on COSMIC-1 radio occultations

作　　者：刘晓文 LIU Xiaowen(Shandong Guangyuan Geotechnical Engineering Company Limited,Yantai 264000,China)

机构地区：[1]山东广源岩土工程勘察有限公司,山东烟台264000

出　　处：《山东理工大学学报（自然科学版）》2024年第6期27-31,共5页Journal of Shandong University of Technology:Natural Science Edition

摘　　要：基于COSMIC-1(constellation observing system for meteorology,ionosphere and climate-1)掩星的电子密度数据,利用四阶球谐函数建立了全球电离层的电子密度模型,探究了电子密度随经度、纬度、高度、地方时和季节的变化规律。研究结果表明:(1)350~550 km处的电子密度主要集中在25°S~25°N的范围内,呈现出明显的地磁纬度相关性;(2)在12:00 UT时,350 km处的电子密度最大,250 km处的电子密度次之,450 km和550 km的电子密度较小;(3)从地方时角度来看,电子密度峰值主要集中在12:00~16:00 LT;(4)从季节变化角度来看,春季和秋季的电子密度峰值最大,冬季次之,夏季最小,这与电离层的半年变化和年度变化一致。该模型能够较好地体现电子密度的变化规律。Based on the electron density data from COSMIC-1(constellation observing system for meteorology,ionosphere and climate-1)satellites,the electron density model of the global ionosphere was established using the fourth-order spherical harmonic function.The variations of the electron density with latitude,longitude,altitude,local time,and season were investigated.The results showed that:(1)the electron density at 350~550 km is mainly concentrated in the range of 25°S~25°N,showing obvious geomagnetic latitude correlation;(2)at 12:00 UT,the electron density at 350 km was greatest,followed by the second highest at 250 km,and smaller densities at 450 km and 550 km;(3)from the local time perspective,the peak electron density is mainly concentrated from 12:00 to 16:00 LT.(4)From the point of view of seasonal variation,the peak electron density was largest in spring and fall,followed by winter and smallest in summer,which is consistent with the semiannual and annual variations of the ionosphere.In conclusion,the model is able to well represent the variation rules of electron density.

关 键 词：电离层 电子密度 无线电掩星 球谐函数 

分 类 号：P352.2[天文地球—空间物理学]