项目名称: 平流层突然增温期间电离层赤道异常区周期性变化研究
项目编号: No.41464006
项目类型: 地区科学基金项目
立项/批准年度: 2015
项目学科: 天文学、地球科学
项目作者: 莫晓华
作者单位: 广西民族大学
项目金额: 45万元
中文摘要: 平流层突然增温期间电离层赤道异常区的形态变化特征是当今电离层研究的热点,本课题通过研究平流层突然增温期间赤道异常区周期性变化,揭示赤道异常的演化机理和低纬度电离层的动力学过程.利用从全球定位系统(GPS)台站观测数据、麻省理工学院(MIT)的全球总电子含量数据和卫星探测数据(如CHAMP等卫星)获得赤道异常峰位置数据,同时结合各种电离层参量(如赤道电激流、F2层最大电子密度高度和F2层临频等)和大气参量(如大气温度和电场等)数据,开展赤道异常峰经向运动的周日、季节和太阳活动变化规律分析;针对多个平流层突然增温事件,进行平流层突然增温期间中国赤道异常区周期性变化个例分析和统计分析;对比分析各个经度区域南北赤道异常区周期性变化情况,研究平流层突然增温期间赤道异常区周期性的区域和经度变化规律;利用模型对赤道异常区周期性变化进行模拟,分析平流层突然增温期间赤道异常区周期性变化的过程和机理。
中文关键词: 电离层赤道异常;总电子含量;平流层突然增温;GPS
英文摘要: The variation of ionospheric morphology features in the equatorial ionization anomaly(EIA) during the sudden stratospheric warming (SSW)is a hot issue in the research of the ionosphere,the evolution mechanism of EIA and the dynamic process in the low-latitude ionosphere is revealed through studying periodic variation in the EIA region during the SSW.Based on the geomagnetic latitude of EIA crest obtained by Global Positioning System(GPS) observations data, global total electron content data of MIT and satellite measurements data (such as CHAMP satellite), combining with various ionospheric parameters (such as equatorial electrojet, F2 layer peak height, F2 layer critical frequency) and atmospheric parameters (such as atmospheric temperture), the diurnal, seasonal and solar activity variation in meridional movement of EIA crest are analyzed; the periodic variation in the China EIA region during the multiple SSW events are studied through case and statistical analysis; the region and longitude variation of the periodicity in the EIA region are studied during the SSW through comparatively analyzing the periodic variation in the southern and northern EIA region around each longitude area; the process and mechanism of periodic variation in the EIA region during the SSW are analyzed by model simulating.
英文关键词: Equatorial ionization anomaly;Total electron content;Sudden stratospheric warming;Global Positioning System