1998年5月日冕三维结构的数值模拟

	1998年5月日冕三维结构的数值模拟
	叶占银 ; 魏奉思 ; 冯学尚 ; 石勇 ; 姚久胜
刊名	空间科学学报
	2001
卷号	21 期号:4 页码:289-296
关键词	三维理想磁流体力模式 MHD数值模拟日冕三维结构日地空间太阳风
ISSN号	0254-6124
其他题名	THREE-DIMENSIONAL NUMERICAL CORONAL MODEL OF CARRINGTON ROTATION 1935 AT MAY 1998
通讯作者	北京8701信箱
中文摘要	采用三维理想磙流体力学(MHD)模式,内边界条件把二维投影特征线边界方法推广应用到三维计算,有效地稳定了数值计算并保证稳态解的自洽性;初始猜解磁场由1935卡林顿周光球磁场观测数据得到,这样计算得到的1998年5月份期间日冕三维结构比较符合实际,计算结果表明:(1)计算得到的源表面非径向磁场量值在磁中性线附近不超过2μT,表明源表面磁场基本径向.(2)模拟得到的源表面径向磁场量值除了在磁中性线附近的区域外变化不大,这和观测一致.(3)由源表面磁场按平方反比的规律计算出1AU处磁场量值更接近观测值.(4)计算得到的日冕结构和观测定性一致,三维数值模拟结果表明,日冕的三维大尺度背景结构主要是由磁场决定的,在闭磁场处或者电流片附近,太阳风的密度高,速度低;在开场区,太阳风的密度低,速度高.
英文摘要	Three-dimensional coronal structure of Carrington rotation 1935 at May 1998 is obtained by using a three-dimensional numerical model of ideal magnetohydro-dynamic equations.In this numerical model,MacCormark-II scheme is employed for the discretization of the governing equations in computational domain and non-reflecting projected-characteristic condition is adopted at inner boundary to keep the simulation stable and the solution self-consistent.With the numerical model,iteration is carried out with initial magnetic field constructed from photosphere observation at 1935 Carrington rotation by Legendre series expansion and finally approaches a steady state.The iteration results show that:(1) magnetic field on source surface is nearly in radial direction with non-radial magnetic field compo-nent no more than 2 Tnear the neutral line.(2)The value of radial magnetic field component on source surface has no much variation except near the neutral line.This agrees with Ulysess observation.(3) The magnitude of radial magnetic field component at 1 AU, calculated from that on source surface by rule of r-2, approxi-mates observation better than that obtained by potential model.(4) 3-D numerical coronal structure agrees qualitatively with observation.The 3-D numerical results also show that magnetic field dominates global solar wind structure,in which den-sity of solar wind is high and speed is low in close magnetic field and near current sheet, while density is low and speed is high at open magnetic field.
学科主题	空间物理
收录类别	CSCD
资助信息	中国科学院空间科学与应用研究中心所长基金资助
语种	中文
CSCD记录号	CSCD:688257
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.cssar.ac.cn/handle/122/1295]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	叶占银,魏奉思,冯学尚,等. 1998年5月日冕三维结构的数值模拟[J]. 空间科学学报,2001,21(4):289-296.
APA	叶占银,魏奉思,冯学尚,石勇,&姚久胜.(2001).1998年5月日冕三维结构的数值模拟.空间科学学报,21(4),289-296.
MLA	叶占银,et al."1998年5月日冕三维结构的数值模拟".空间科学学报 21.4(2001):289-296.