基于2016-2018年IGS台网观测的美洲地区的低纬电离层特征分析  

Characteristics of ionization anomaly in low-latitude ionosphere based on IGS network observations during 2016-2018 at America sector

作　　者：罗伟华[1] 冯睿 耿令森 LUO Weihua;FENG Rui;GENG Lingsen(College of Electronics and Information Engineering,South-Central Minzu University,Wuhan 430074,China)

机构地区：[1]中南民族大学电子信息工程学院,武汉430074

出　　处：《中南民族大学学报（自然科学版）》2024年第1期112-118,共7页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：国家自然科学基金资助项目(41474134,41474135)。

摘　　要：基于2016-2018年IGS台网的地基GPS观测数据,反演电离层总电子含量(Total Electron Content,TEC),分析了美洲地区(300°E)赤道电离异常(Equatorial Ionization Anomaly,EIA)和低纬电离异常(Low-latitude Ionization Anomaly,LIA)随时间、月份和太阳活动的变化特征.结果显示:EIA和LIA的强度均在地方时1300-1500 LT附近出现极大;春/秋季的强度比其他季节的要大;EIA和LIA的强度还随着太阳活动的减弱而减小.EIA和LIA的南-北半球不对称在地方时1700-2100 LT出现极大;夏季(5-8月)的不对称性最为明显.另外,EIA的强度较LIA的强度要大,而LIA的南-北半球不对称特征较EIA的南-北半球不对称特征更为显著.Based on ionospheric Total Electron Content(TEC)inferred from ground-based GPS observations of IGS network during 2016-2018,the characteristics of Equatorial Ionization Anomaly(EIA)and Low-latitude Ionization Anomaly(LIA)in America sector(300°E)varying with times,months and solar activities were studied.The results showed that the EIA strength and LIA strength reached the maximum around 1300-1500 LT,the EIA and LIA strengths were larger in equinoctial months than that in other months,and they would be weaker with the decrease of solar activity.The north-south asymmetries of EIA and LIA reached the maximum around 1700-2100 LT,and they were more remarkable in summer months(May-August)than that in other months.Moreover,EIA strength was larger than LIA strength,while the north-south asymmetry of LIA would be more significant that the EIA asymmetry.

关 键 词：低纬电离层 电离异常 美洲 

分 类 号：P352[天文地球—空间物理学]