徐佳莹^1,,
吕建永^1,,,
王明¹,
郭建广²
1. 空间天气研究所, 数学与统计学院, 南京信息工程大学, 南京 210044
2. 国家卫星气象中心, 北京 100081

基金项目: 国家自然科学基金项目（41574158，U1631107，41604141）和江苏省双创团队资助


详细信息

作者简介: 徐佳莹, 女, 1992年生, 硕士研究生, 现主要从事太阳风-磁层耦合方面研究.E-mail:xu_jy16@163.com

通讯作者: 吕建永, 男, 1966年生, 博士, 教授, 主要从事多尺度空间天气数值模拟研究.E-mail:jylu@nuist.edu.cn

中图分类号: P353

收稿日期:2018-03-06
修回日期:2018-05-04
上线日期:2018-09-05

Cusp location dependence on IMF: Cluster statistical study

XU JiaYing^1,,
Lü JianYong^1,,,
WANG Ming¹,
GUO JianGuang²
1. Institute of Space Weather, School of Mathematics and Statistics, Nanjing University of Information Science & Technology, Nanjing 210044, China
2. National Satellite Meteorological Center, Beijing 100081, China


More Information

Corresponding author: Lü JianYong,E-mail:jylu@nuist.edu.cn

MSC: P353

--> Received Date: 06 March 2018
Revised Date: 04 May 2018
Available Online: 05 September 2018


摘要
摘要:利用Cluster卫星数据，选取2001—2010年期间的616个极尖区穿越事件，研究了行星际磁场（IMF）的大小和方向对极尖区位形的影响.结果表明：当B_z为北向时，随着B_x负向的增大，极尖区的磁不变纬度向高纬方向（极区）移动；当B_z为南向时，随着B_x负向增大，极尖区的磁不变纬度略微向低纬度方向（赤道）移动.B_x正向增大时，极尖区并没有明显移动.B_x对极尖区影响在南半球较为显著，在北半球没有明显规律性变化.此外，随着行星际磁场锥角的增大（>90°），极尖区也随之向高纬移动.当B_z南向时，随着B_y的负向增大，极尖区在北半球向晨侧移动，在南半球向昏侧移动.而当B_z南向增加时，南北半球两个极尖区的磁不变纬度都朝赤道方向移动；但北向B_z时几乎没有移动.
关键词: 极尖区/
行星际磁场/
Cluster卫星

Abstract:The 616 mid and high altitude cusp crossings, collected from Cluster observation for the time interval from 1st February 2001 to 31st December 2010, are used to study IMF effect on cusp locations. Our results show that with the increasing of the negative B_x, the invariant latitude of the cusp moves to poleward for northward IMF, while it slightly shifts equatorward for southward IMF. For the increasing positive B_x, the invariant latitude of the cusp doesn't change too much. This phenomenon is observed obviously for the southern hemisphere, but no apparent phenomenon occurs on the northern hemisphere. When cone angle is greater than 90°, the southern cusp has a polarward movement with increasing cone angle. Moreover, when the negative B_y is enhanced, the magnetic local time of cusp turns dawnward (duskward) for northern (southern) hemisphere under southward IMF. Consistent with previous study, we also find that with the increasing of southward B_z, the invariant latitude of the cusp moves equatorward for both northern and southern hemisphere, while it keeps almost unchanged for northward B_z.
Key words:Cusp/
IMF/
Cluster



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