中纬电离层电子密度和垂直漂移速度的潮汐波谱对比分析  

Tidal spectrum analysis of electron density and plasma vertical velocity at mid-latitudes

作　　者：王慧[1,2] 刘丁维 

机构地区：[1]武汉大学电子信息学院空间物理系,武汉430072 [2]中国科学院国家空间科学中心,北京100190

出　　处：《科学通报》2015年第33期3239-3250,共12页Chinese Science Bulletin

基　　金：国家自然科学基金(41222030;412221003;41431073)资助

摘　　要：利用CHAMP卫星观测数据对全球中纬电离层电子密度(?Ne)和纬向风引起的等离子体漂移速度(?Vz)进行了非迁移潮汐波谱分析,研究发现:D0(DE1)为南(北)半球?Ne和?Vz大尺度一(二)波结构的主导周日非迁移潮汐分量,南半球主导波谱幅度大于北半球;全球电离层-热层模型证实这些主导潮汐分量主要由电离层-热层当地物理过程激发;?Ne和?Vz主导波谱强度的相对强弱程度不同,随季节的变化规律不一致,对太阳活动水平的响应也相反,表明观测到的电子密度的经向差异还来源于除纬向风之外的其他物理过程.This study investigates the global magnetic local time versus longitudinal pattern of electron density （Ne） and vertical plasma velocity induced by the zonal wind （Vz） at mid-latitudes. The tidal signatures of both Ne and Vz are analyzed by using CHAMP observations. DE1 （DO） are major diurnal tidal component for the large scale wave-2 and wave-1 structures in both Ne and Vz in the Northern and Southern Hemispheres. The tidal amplitudes of Ne and Vz exhibit hemispheric asymmetries, i.e., larger in the south than in the north. The global ionosphere-thermosphere model without up-propagating tides can reproduce generally well the observed large scale longitudinal structure of Ne. This supports the important role of in situ physical processes. The relative amplitudes of the tidal components as well as their seasonal and solar cycle variations of Ne are not always consistent with those of Vz. These discrepancies suggest that there exist other mechanisms that can modulate the longitudinal distribution of Ne, which should be considered in the future work.

关 键 词：电子密度 非迁移潮汐波谱分析 纬向风 数值模拟 

分 类 号：P352[天文地球—空间物理学]