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行星际背景太阳风的三维MHD数值模拟
Alternative TitleThree-dimensional MHD simulation of interplanetary solar wind
杨子才; 沈芳; 杨易; 冯学尚
Department空间科学部
Source Publication地球物理学报
2018
Volume61Issue:11Pages:4337-4347
DOI10.6038/cjg2018L0515
ISSN0001-5733
Language中文
KeywordMhd 太阳风 模拟 预报
Abstract

近地空间的太阳风参数预报具有重要的科学研究意义和实际应用价值,三维磁流体力学(MHD)数值模拟是太阳风参数预报的重要手段.本文建立了一套基于经验模型的三维MHD数值模型.模型的内边界设置在0.1天文单位(AU)处,在六片网格系统下利用TVD Lax-Friedrich格式求解理想MHD方程组,采用扩散法消除磁场的散度.模型以GONG的观测磁图作为输入数据,利用经验模型并结合卫星观测特征确定内边界条件.边界条件中保留了6个可调参数,以便适当调整参数使其方便适合模拟不同太阳活动期的太阳风.利用该模型分别模拟了2007年和2016年的背景太阳风,得到了太阳风速度、密度、温度和磁场强度,这些参数与ACE/WIND卫星观测符合较好.

Other Abstract

The prediction of solar wind parameters near the Earth has important scientific research significance and practical application value. Three-dimensional magnetohydrodynamics (MHD) numerical simulation is a primary tool in the prediction of solar wind parameters. This paper presents a three-dimensional MHD numerical model which can be used to simulate the background solar wind in the interplanetary space. The inner boundary of the model is set at 0.1 astronomical unit (AU) and a six-component grid system is employed in the computation domain. The ideal MHD equations are solved by using the total variation diminution (TVD) Lax-Friedrich scheme, and the divergence of the magnetic field is eliminated by a diffusion method. This model uses magnetogram synoptic map images from the Global Oscillation Network Group (GONG) observation as input data. The empirical Wang-Sheeley-Arge (WSA) relation is used to assign solar wind speed at the inner boundary, while density and temperature are specified according to the characteristics of satellite observations. There are six free parameters in the boundary conditions, which can be tuned to simulate the solar wind for different phases of the solar cycle. This model is used to simulate the background solar wind in 2007 and 2016, respectively, and the simulated solar wind parameters (including speed, density, temperature, and the magnetic field strength) are in good agreement with the ACE/WIND satellite observations.

Indexed BySCI ; EI ; CSCD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/6597
Collection空间科学部
Corresponding Author沈芳
Recommended Citation
GB/T 7714
杨子才,沈芳,杨易,等. 行星际背景太阳风的三维MHD数值模拟[J]. 地球物理学报,2018,61(11):4337-4347.
APA 杨子才,沈芳,杨易,&冯学尚.(2018).行星际背景太阳风的三维MHD数值模拟.地球物理学报,61(11),4337-4347.
MLA 杨子才,et al."行星际背景太阳风的三维MHD数值模拟".地球物理学报 61.11(2018):4337-4347.
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