王明^1,,
于超^1,2,
吕建永¹,
袁换只¹,
周悦¹,
刘子谦³,
虞超⁴,
顾春丽⁵
1. 南京信息工程大学数学与统计学院空间天气研究所, 南京 210044
2. 中国气象局空间天气重点开放实验室/国家空间天气监测预警中心, 北京 100081
3. 中国科学院国家空间科学中心, 北京 100080
4. 江苏省扬中市气象局, 江苏扬中 212200
5. 北京应用气象研究所, 北京 100029

基金项目: 国家自然科学基金(41604141, 41574158, U1631107), 江苏省自然科学基金(BK20160952), 国家卫星气象中心重点开放实验室开放研究基金, 江苏省双创团队资助


详细信息

作者简介: 王明, 男, 1986年生, 博士, 讲师, 主要从事太阳风-磁层相互作用方面研究.E-mail:mingwang@nuist.edu.cn

中图分类号: P352

收稿日期:2018-12-18
修回日期:2020-01-03
上线日期:2020-05-05

Effects of IMF B_y on the bow shock: MHD results

WANG Ming^1,,
YU Chao^1,2,
LU JianYong¹,
YUAN HuanZhi¹,
ZHOU Yue¹,
LIU ZiQian³,
YU Chao⁴,
GU ChunLi⁵
1. Institute of Space Weather, School of Math & Statistics, Nanjing University of Information Science & Technology, Nanjing 210044, China
2. Key Laboratory of Space Weather, National Center for Space Weather, China Meteorological Administration, Beijing 100081, China
3. Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100080, China
4. Yangzhong Meteorological Bureau, Yangzhong Jiangsu 212200, China
5. Beijing Institute of Applied Meteorology, Beijing 100029, China


MSC: P352

--> Received Date: 18 December 2018
Revised Date: 03 January 2020
Available Online: 05 May 2020


摘要
摘要:利用全球磁流体模拟的结果，本文研究了行星际磁场B_y对弓激波位型的影响.结果显示：随着行星际磁场B_y绝对值的增大，弓激波的日下点距离、旋转对称张角、南北非对称性以及旋转非对称性均随之增加.其中，B_y对弓激波日下点距离的影响可达5 R_E左右.东向B_y和西向B_y对弓激波位型影响具有对称性，东向B_y和西向B_y大小相同时弓激波日下点距离、旋转对称张角以及旋转非对称性参数均相同，而南北非对称性参数大小相同正负相反.行星际磁场B_y占主导时弓激波尾部横截面在南北方向上拉伸，并且拉伸程度随着B_y绝对值的增大而增大，弓激波尾部横截面的拉伸现象与磁声波马赫数密切相关.
关键词: 行星际磁场B_y/
弓激波/
磁流体模拟

Abstract:Using the global magnetohydrodynamic (MHD) simulation, we investigate the effects of the Y component of interplanetary magnetic field (IMF) B_y on the shape and size of the bow shock. Our results show that with the increasing absolute value of B_y, the bow shock's standoff distance, the flaring angle of the rotationally symmetry, the north-south asymmetric parameter, and the rotationally asymmetric parameter all increase. The extent of the B_y effects on the bow shock's standoff distance can reach 5 R_E. The influences of the eastward and westward B_y on the bow shock are symmetric. For the same absolute value of the eastward and westward B_y, the bow shock's standoff distances, the flaring angles of the rotationally symmetry, and the rotationally asymmetric parameters have the same values, while the north-south asymmetric parameters have the same absolute values but with a different sign. The bow shock tail's cross-section is elongated in the north-south direction under B_y conditions, and the extent of the elongation is enhanced with increasing B_y. The elongation of the bow shock tail's cross-section is closely related to the magnetosonic Mach number.
Key words:IMF B_y/
Bow Shock/
MHD



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