%0 Journal Article
%T A modeling study of interplanetary-equatorial electric field penetration efficiency<br>行星际-赤道电场穿透效率的数值模拟研究
%A WEI Yong
%A HONG Ming-Hua
%A WAN Wei-Xing
%A DU Ai-Min
%A <br>魏勇
%A 洪明华
%A 万卫星
%A 杜爱民
%J 地球物理学报
%D 2008
%I 
%X As an important way of solar wind-magnetosphere-ionosphere coupling during strong geomagnetic activity period,electric field penetration has been an active topic in space physics for many years.In the past four decades,many researchers were interested in the observational evidence and theoretic modeling to search for the physical mechanism,however,the "electric field penetration efficiency",which is supposed to be an important quantitative index,has received less attention.Defining the penetration efficiency as the ratio of equatorial electric field increment to the corresponding interplanetary electric field increment,this paper aims to discuss the local time dependence of electric field penetration efficiency and its relation to neutral wind.Our result of numerical modeling suggests that:(1)Without considering transpolar potential saturation,equatorial electric field increment linearly responds to IEF increment,and neutral wind does not affect the penetration efficiency;(2)Assuming constant magnetic reconnection length L=2.6 RE,the local time dependence of penetration efficiency can be described as follows:it is about 10% between 9 and 23LT,however,increases rapidly from 2% up to 30% and decreases quickly to 2% between 0 and 7LT.All above characteristics are basically consistent with observations.
%K Solar wind-magnetosphere-ionosphere coupling
%K Interplanetary electric field
%K Electric field penetration<br>太阳风-磁层-电离层耦合
%K 行星际电场
%K 电场穿透
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=1E44AE713D8A6DE0&jid=14DC41C59CBF6770055A7D610D53AE46&aid=29D8D1E093BA5B1B8618C757254FA09B&yid=67289AFF6305E306&vid=987EDA49D8A7A635&iid=94C357A881DFC066&sid=0B2455B0C3E7C267&eid=0414C929218EC5F4&journal_id=0001-5733&journal_name=地球物理学报&referenced_num=0&reference_num=12