Numerical simulations of rotating axisymmetric sunspots
Numerical simulations of rotating axisymmetric sunspots
复制标题
旋转轴对称太阳黑子的数值模拟
DOI:
10.1111/j.1365-2966.2008.13359.x
复制
发表时间:
2008
影响因子:
4.8
通讯作者:
Botha G
中科院分区:
文献类型:
--
作者:
Botha G
A numerical model of axisymmetric convection in the presence of a vertical magnetic flux bundle and rotation about the axis is presented. The model contains a compressible plasma described by the non-linear MHD equations, with density and temperature gradients simulating the upper layer of the Sun's convection zone. The solutions exhibit a central magnetic flux tube in a cylindrical numerical domain, with convection cells forming collar flows around the tube. When the numerical domain is rotated with a constant angular velocity, the plasma forms a Rankine vortex, with the plasma rotating as a rigid body where the magnetic field is strong, as in the flux tube, while experiencing sheared azimuthal flow in the surrounding convection cells, forming a free vortex. As a result, the azimuthal velocity component has its maximum value close to the outer edge of the flux tube. The azimuthal flow inside the magnetic flux tube and the vortex flow is prograde relative to the rotating cylindrical reference frame. A retrograde flow appears at the outer wall. The most significant convection cell outside the flux tube is the location for the maximum value of the azimuthal magnetic field component. The azimuthal flow and magnetic structure are not generated spontaneously, but decay exponentially in the absence of any imposed rotation of the cylindrical domain.
登录
查看更多内容
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
D. Alexander
通讯作者:
D. Alexander
影响因子:
1.3
作者:
P. Gilman
通讯作者:
P. Gilman
DOI:
--
发表时间:
2002
期刊:
影响因子:
--
作者:
A. Kosovichev
通讯作者:
A. Kosovichev
DOI:
--
发表时间:
1984
期刊:
影响因子:
--
作者:
N. Hurlburt;J. Toomre;J. Massaguer
通讯作者:
J. Massaguer
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
T. Imamura;T. Hirai;S. Enomoto;K. Yamamoto;山口隆史;Hiroaki Kobayashi
通讯作者:
Hiroaki Kobayashi