NUMERICAL SIMULATIONS OF IMPULSIVELY EXCITED ACOUSTIC-GRAVITY WAVES IN A STELLAR ATMOSPHERE

被引：3

作者：

Gruszecki, M. ^{[1
]}

Murawski, K. ^{[2
]}

Kosovichev, A. G. ^{[3
]}

Parchevsky, K. V. ^{[3
]}

Zaqarashvili, T. ^{[4
]}

机构：

[1] Univ Warwick, Dept Phys, Ctr Fus Space & Astrophys, Coventry CV4 7AL, W Midlands, England

[2] Marie Curie Sklodowska Univ, Grp Astrophys & Grav Theory, Inst Phys, PL-20031 Lublin, Poland

[3] Stanford Univ, WW Hansen Expt Phys Lab, Stanford, CA 94305 USA

[4] Georgian Natl Astrophys Observ, Abastumani Astrophys Observ, GE-0160 Tbilisi, Georgia

来源：

ACTA PHYSICA POLONICA B | 2011年 / 42卷 / 06期

关键词：

ADAPTIVE MESH REFINEMENT; SOLAR; HYDRODYNAMICS; EXCITATION;

D O I：

10.5506/APhysPolB.42.1333

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We aim to consider impulsively-generated non-linear acoustic-gravity waves in a gravitationally-stratified stellar atmosphere. Two-dimensional hydrodynamic equations are solved numerically for an ideal plasma with a realistic temperature profile. The numerical results show that an initial pulse in vertical velocity excites a leading wave front which is followed by a dispersive wake, oscillating with a period close to the acoustic cut-off period P-ac of the chromosphere. Impulses launched deeper within a low region of the stellar atmosphere result in a wake of smaller Pac. They form quasi-periodic shocks traveling from the chromosphere to the corona. The interaction of the secondary ("rebound") shocks with the chromosphere-corona transition region generates vortex motions, which may play important role the transition region dynamics.

引用

页码：1333 / 1344

页数：12

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