对流电场、场向电流和极光区电集流变化的地磁响应

doi:10.3321/j.issn:0001-5733.1999.06.001

CORC > 北京大学 > 地球与空间科学学院

	对流电场、场向电流和极光区电集流变化的地磁响应; Geomagnetic responses to the convection field, field-aligned current and auroral electrojet
	沈长寿 ; 资民筠 ; 高玉芬 ; 索玉成 ; 吴健
刊名	地球物理学报
	1999
关键词	地磁响应对流电场场向电流极光区电集流 geomagnetic response convection field field-aligned current auroral electrojet
DOI	10.3321/j.issn:0001-5733.1999.06.001
英文摘要	对流电场、场向电流和极光区电集流是磁层一电离层耦合的主要物理过程．它们的演化发展时间分别为几分钟至半小时的量级．本文用１００°Ｅ和３００°Ｅ的两个地磁经度链附近各１１个台站的１ｍｉｎ均值地磁Ｈ和Ｚ分量资料，分析了１９９４年４月１６—１７日磁暴期间磁层耦合过程对极光区和中低纬区电离层扰动的地磁特征．强磁暴开始时，台站所处的地方时位置不同，则观测到的电离层和地磁响应也完全不同．这是磁层对流和一、二区场向电流共同作用的结果．一般说，扰时极光区的西向电集流变化更为强烈．随着耦合的发展，极光区范围会向南北扩展，电集流中心带则向低纬侧移动．在中低纬区，二区场向电流的建立能屏蔽一区场向电流所产生的扰动，并引...; Convection field, field-aligned current and auroral electrojet are all very important processes in the magnetosphere-ionosphere coupling. The time scale of their evolution is about several minutes to half an hour. In this paper geomagnetic data of H- and Z-component with time resolution of one minute from each 11 stations nearby 100 degrees E GM and 300 degrees E GM meridians are used to analyze the effect of magnetospheric disturbance on geomagnetic features of the auroral electrojet and disturbed currents in mid- and low-latitude ionospheres during a magnetic storm on April 16-17, 1994. It is shown that the geomagnetic response of the magnetosphere -ionosphere coupling is related to the local time zone of the station. This is caused by the combined effects of the magnetospheric convection pattern and the field-aligned current systems. During a magnetic storm, genarally speaking, the variation of the westward auroral electrojet is the stronger one, and the auroral region may expand both poleward and equatorward. Besides, the center belt of the electrojet will move toward lower latitude. At the mid-latitude ionosphere the establishment of the region 2 field-aligned current will shield the disturbance caused by the region 1 field-aligned current and produce a reversed current leading to a reversed geomagnetic field. These may cause a short time increasing of a eastward electric field at night side. As a result, the simultaneously h' F (minimum vertual height for F-region) enhancement due to the E X B drift effect will be observed at several stations nearby a meridian. On the other hand, variations of geomagnetic field near the equator area are mainly influenced by the ring current and the ionospheric equatorial electrojet.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000084411600001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); 中文核心期刊要目总览(PKU); 中国科学引文数据库(CSCD); 3; 06; 725-731; 42
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/310982]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	沈长寿,资民筠,高玉芬,等. 对流电场、场向电流和极光区电集流变化的地磁响应, Geomagnetic responses to the convection field, field-aligned current and auroral electrojet[J]. 地球物理学报,1999.
APA	沈长寿,资民筠,高玉芬,索玉成,&吴健.(1999).对流电场、场向电流和极光区电集流变化的地磁响应.地球物理学报.
MLA	沈长寿,et al."对流电场、场向电流和极光区电集流变化的地磁响应".地球物理学报 (1999).