VISCOUS MAGNETOHYDRODYNAMIC MODES AND P-MODE ABSORPTION BY SUNSPOTS

被引：58

作者：

LOU, YQ

机构：

[1] NATL CTR ATMOSPHER RES,HIGH ALTITUDE OBSERV,ADV STUDY PROGRAM,BOULDER,CO 80307

[2] UNIV HEIDELBERG,INST THEORET ASTROPHYS,W-6900 HEIDELBERG,GERMANY

来源：

ASTROPHYSICAL JOURNAL | 1990年 / 350卷 / 01期

关键词：

Hydromagnetics; Sun: oscillations; Sun: sunspots; Wave motions;

D O I：

10.1086/168399

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We discuss several features of viscous compressible magnetohydrodynamic (MHD) modes in a uniformly magnetized medium and viscous MHD mode conversion in the presence of background inhomogeneity. For the static background equilibrium in which physical quantities vary continuously, the well-known singularities for ideal MHD perturbations are removed by viscosity, and in their places the viscous MHD resonance layers appear. It is shown that in the presence of the viscous MHD resonance layers, viscous MHD mode conversion can be very effective in absorbing the power of an incident acoustic wave upon an isolated, inhomogeneously magnetized flux tube. Based on this, we suggest a possible interpretation for the reported p-mode absorption by sunspots embedded in the solar photosphere.

引用

页码：452 / 462

页数：11

共 38 条

[31]

LOU YQ, 1988, ESA SP286, P305

[32]

MOK Y, 1987, ASTRON ASTROPHYS, V172, P327

[33]

Pierce A.D., 1981, ACOUSTICS

[34] COMPUTATIONAL SOLUTION OF LINEAR 2-POINT BOUNDARY-VALUE PROBLEMS VIA ORTHONORMALIZATION [J].