梅雪飞^1,,
罗伟华^2,3,,,
蔡红涛¹,
朱正平^2,3,
常珊珊²
1. 武汉大学电子信息学院, 武汉 430072
2. 中南民族大学电子信息工程学院, 武汉 430074
3. 中南民族大学智能无线通信湖北省重点实验室, 武汉 430074

基金项目: 国家自然科学基金项目（41474134，41474135，41704161）和电波环境特性及模化技术重点实验室专项资金资助


详细信息

作者简介: 梅雪飞, 女, 1993年生, 硕士研究生, 主要从事电离层研究.E-mail:z1470258@163.com

通讯作者: 罗伟华, 男, 副教授, 主要从事电离层研究.E-mail:whlu@whu.edu.cn

中图分类号: P352

收稿日期:2018-11-16
修回日期:2019-08-21
上线日期:2019-09-05

Characteristic of the Equatorial Ionization Anomaly strength and hemispheric asymmetry based on IGS network during 2001-2008

MEI XueFei^1,,
LUO WeiHua^2,3,,,
CAI HongTao¹,
ZHU ZhengPing^2,3,
CHANG ShanShan²
1. School of Electronic Information, Wuhan University, Wuhan 430072, China
2. College of Electronic Information and Engineer, South-Central University for Nationalities, Wuhan 430074, China
3. Hubei Key Laboratory of Intelligent Wireless Communication, South-Central University for Nationalities, Wuhan 430074, China


More Information

Corresponding author: LUO WeiHua,E-mail:whlu@whu.edu.cn

MSC: P352

--> Received Date: 16 November 2018
Revised Date: 21 August 2019
Available Online: 05 September 2019


摘要
摘要:赤道电离异常（Equatorial Ionization Anomaly，EIA）是低纬电离层中的一个重要现象.本文基于IGS台网提供的2001—2008年期间的电离层总电子含量（Total Electron Content，TEC）数据，分析了120°E区的EIA强度和磁南北半球不对称性在磁平静时期的变化特征，包括对地方时、季节和太阳活动的依赖.本文结果表明，（1）EIA强度表现出显著的随地方时和季节的变化特征.EIA强度在0200LT和2000LT附近分别出现一个极值，且2000LT附近的EIA强度更大；EIA强度通常在春/秋季较大，在夏/冬季较小，且冬季要大于夏季.（2）EIA南北半球不对称也表现出随地方时和季节变化特征.EIA半球不对称在0200LT和2000-2200LT附近分别出现一个极值；EIA半球不对称的季节变化特征还依赖于太阳活动，太阳活动高年期间，EIA半球不对称通常在春/秋季更显著；太阳活动低年期间，EIA半球不对称通常在冬季更显著.（3）EIA强度和半球不对称性的逐日变化和月变化表现出对太阳活动存在一定的依赖，但依赖性并不显著.2000LT（0200LT）附近的EIA强度的月变化与太阳活动整体呈正（负）相关，而2200LT（0200LT）附近的EIA半球不对称的月变化与太阳活动整体呈负（负）相关.（4）影响EIA强度变化的主要因素可归于纬圈电场和中性风场；影响EIA半球不对称变化的主要因素可归因为子午中性风场.
关键词: 电离层/
赤道电离异常/
强度/
半球不对称/
IGS

Abstract:Equatorial Ionization Anomaly(EIA) is a significant phenomenon of low-latitude ionosphere. Based on ionospheric Total Electron Content (TEC) data from IGS network during 2001-2008, the characteristics of EIA strength and magnetic north-south asymmetry were studied in 120°E during magnetically quiet days, including the dependence on local time, season and solar activity. In this study, the results can be concluded:(1) EIA strength showed significant variations with local times and seasons. EIA strength reached a maximum value around 0200LT and 2000LT, respectively; and EIA strength around 2000LT was stronger than that around 0200LT. EIA strength was always stronger in spring and autumn equinox than that in summer and winter, and the strength in winter was stronger than that in summer. (2) EIA north-south asymmetry also displayed variations with local times and seasons. EIA north-south asymmetry reached a maximum value near 0200LT and 2000-2200LT, respectively; the seasonal variations of EIA asymmetry also depended on solar activity. During high solar activity, EIA north-south asymmetry was always more significant in spring and autumn; while during low solar activity, EIA north-south asymmetry was more remarkable in winter. (3) The variations of EIA strength and north-south asymmetry also depended on solar activities, though the dependences were not remarkable. There was a positive (negative) correlation between the monthly variations of EIA strength around 2000LT (0200LT) and solar activity overall, while a negative(negative) correlation between the monthly variations of EIA hemispheric asymmetry and solar activity. (4) The major factors leading to the variations of EIA strength can be attributed to neutral wind and zonal electric field; and the key factor affecting the variations of EIA hemispheric asymmetry can be attributed to meridional neutral wind.
Key words:Ionosphere/
Equatorial Ionization Anomaly/
Strength/
Hemispheric asymmetry/
IGS



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