Dayside poleward moving auroral forms and ionospheric convection under stable interplanetary magnetic field (IMF) conditions  

作　　者：XING ZanYang YANG HuiGen HAN DeSheng WU ZhenSen LIU JunMing HU ZeJun ZHANG QingHe HU HongQiao LIU YongHua 

机构地区：[1]School of Science,Xidian University [2]SOA Key Laboratory for Polar Science,Polar Research Institute of China

出　　处：《Science China(Technological Sciences)》2013年第4期910-916,共7页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 41031064,40974103,40974083,40904041,40890164,41104091,and 41104090);the Polar Strategic Research Foundation of China (Grant No. 20120304);the Ocean Public Welfare Scientific Research Project,State Oceanic Administration of the People's Republic of China (Grant No. 201005017)

摘　　要：Using high temporal resolution optical data obtained from three-wavelength all-sky imagers over six winters continuously at Yellow River Station （78.92°N,11.93°E） in Arctic,we statistically investigated the dependence of location of poleward moving auroral forms （PMAFs） on the interplanetary magnetic field （IMF） B z and B y components as a function of MLT and MLAT under stable IMF conditions.It is found that more PMAFs occurred in lower latitude for Bz＆lt;0 and there was less evident IMF B y-related prenoon-postnoon asymmetry for Bz＆lt;0 than for Bz＆gt;0.We found that the PMAFs were distributed over a wide range of MLT when Bz＆lt;0,which indicates that the reconnection X-line might spread like an ’S’ shape.However,during northward IMF,PMAFs were observed predominantly prenoon for IMF By＆gt;0 and postnoon for IMF By＆lt;0 associating with the effect of the high-latitude reconnection,which is largely consistent with the theoretical model of the convection flow.

关 键 词：poleward moving auroral forms （PMAFs） RECONNECTION prenoon-postnoon asymmetry 

分 类 号：P353[天文地球—空间物理学] O241.82[天文地球—地球物理学]