%0 Journal Article
%T AN EVALUATION OF THE TURBOPAUSE ALTITUDE USING n (He) OBSERVED AT PERIGEES OF AE-D SATELLITE<br>用AED卫星近地点上观测的n(He)估算湍流层顶高度
%A SHEN Chang-Shou ZI Min-Yun WANG Jing-Song WANG Ying-Jian XU Ji-Yao School of Earth
%A Space Sciences
%A Peking University
%A Beijing
%A China Laboratory of Space Weather
%A Chinese Academy of Sciences
%A Beijing
%A China
%A <br>沈长寿
%A 资民筠
%A 王劲松
%A 王英鉴
%A 徐寄遥
%J 地球物理学报
%D 2004
%I 
%X In this paper, variations of AE-D's perigee altitudes, the corresponding atmospheric expansion and the density distributions are analyzed. At same heights but on different latitude areas, the density of the lower thermosphere is more intense at low latitude than that at high latitude. So does the satellite drag. Therefore, the perigee is lower at low latitude and it is lower by day than at night. Besides, the data of n(He) observed at perigees are used to roughly estimate the altitudes of the turbopause Z t and their variations according the two distinct vertical distributions of atmospheric composition in low and upper atmospheres: the homogeneous mixing and the diffusive separation. The results show that Z t is almost not related to latitude at high latitude areas, while its response to the magnetic storm is very clear. On the other hand, at low latitude areas Z t increases as the latitude decreases, and the value of Z t is larger by day than at night.
%K Perigee
%K Atmospheric density
%K Mixing
%K Diffusive separation
%K Turbopause<br>AE-D卫星
%K 近地点
%K 湍流层顶
%K 扩散分离
%K 大气密度
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=1E44AE713D8A6DE0&jid=14DC41C59CBF6770055A7D610D53AE46&aid=B2BD99BC19E5B363&yid=D0E58B75BFD8E51C&vid=F4B561950EE1D31A&iid=94C357A881DFC066&sid=1CBB73E9593E8833&eid=34A7AB0452E6AF23&journal_id=0001-5733&journal_name=地球物理学报&referenced_num=1&reference_num=13