地球弓激波的三维模拟

胡慧萍; 吕建永; 周全; 王明; 杨亚芬; 刘子谦; 裴世鑫

doi:10.11728/cjss2015.01.001

地球弓激波的三维模拟

doi: 10.11728/cjss2015.01.001 cstr: 32142.14.cjss2015.01.001

1.
南京信息工程大学数学与统计学院南京 210044
2.
国家卫星气象中心北京 100081
3.
中国石化石油物探技术研究院南京 211103
4.
中国科学院空间科学与应用研究中心空间天气学国家重点实验室北京 100190

基金项目: 国家自然科学基金项目(41031063),公益性行业(气象)科研专项(201106011),江苏省自然科学基金项目(BK2011829)和2012年江苏省普通高校研究生科研创新计划(CXLX120513)共同资助

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中图分类号: P353
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出版历程
- 收稿日期: 2014-01-24
- 修回日期: 2014-07-08
- 刊出日期: 2015-01-15

Simulation of three-dimensional Earth's bow shock

1.
Institute of Space Weather, Nanjing University of Information Science and Technology, Nanjing 210044
2.
National Center for Space Weather, Beijing 100081
3.
Sinopec Geophysical Research Institute, Nanjing 211103
4.
Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190

摘要

摘要: 利用磁流体动力学(MHD)全球模拟结果,根据弓激波的跃变特性确定出弓激波位置,建立了一个新的综合考虑了快磁声马赫数、太阳风动压、行星际磁场强度以及磁层顶曲率半径的弓激波三维位型模型.将新模型与以往模型的模拟结果进行比较发现,新的弓激波全球模型结果可靠,解决了部分现有模型不能描述弓激波三维位型的问题.研究结果表明,在行星际磁场北向时,随着快磁声马赫数的增大,弓激波日下点距离减小,但是在行星际磁场南向时,快磁声马赫数的变化对弓激波日下点距离影响不大;弓激波位型在赤道面与子午面上存在明显的不对称性,而且随着行星际磁场的转向,这种非对称性也会发生相应改变;行星际磁场南向,B_z值较小时,子午面内弓激波位型已经不是简单的抛物线,出现了明显的类似于极尖区磁层顶的凹陷变化区.
- 弓激波 /
- 太阳风 /
- 快磁声马赫数 /
- 磁层顶曲率半径
Abstract: We use a physics-based global Magnetohydrodynamic (MHD) model to investigate the location and shape of the Earth's bow shock. The bow shock locations in the simulations are identified by an automated search algorithm and is fitted by simple analytical functions. A global three dimensional bow shock model is constructed to include the effect of magnetopause and is parameterized by the fast magnetosonic Mach number, solar wind ram pressure, interplanetary magnetic field strength, and magnetopause curvature radius. The model results are compared and agree well with the previous empirical and simulation models. We also find that both the shock standoff distance and the shock flaring angle decrease monotonically with increasing the fast magnetosonic Mach number. The size and location of bow shock on the equatorial plane and the meridian plane show obvious asymmetry.
- Bow shock /
- Solar wind /
- Fast magnetosonic Mach number /
- Magnetopause curvature radius

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参考文献(22)

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