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Numerical simulations of impulsively excited acoustic-gravity waves in a stellar atmosphere

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Gruszecki, M. (Marcin), Murawski, K., Kosovichev, Alexander G., Parchevsky, K. V. and Zaqarashvili, T. (2011) Numerical simulations of impulsively excited acoustic-gravity waves in a stellar atmosphere. Acta Physica Polonica B, Vol.42 (No.6). pp. 1333-1344. doi:10.5506/APhysPolB.42.1333

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Official URL: http://dx.doi.org/10.5506/APhysPolB.42.1333

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Abstract

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.

Item Type: Journal Article
Subjects: Q Science > QA Mathematics
Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Numerical grid generation (Numerical analysis), Solar oscillations, Hydrodynamics, Sound-waves, Gravitational waves
Journal or Publication Title: Acta Physica Polonica B
Publisher: Wydawnictwo Uniwersytetu Jagiellonskiego
ISSN: 0587-4254
Official Date: June 2011
Dates:
DateEvent
June 2011Published
Volume: Vol.42
Number: No.6
Page Range: pp. 1333-1344
DOI: 10.5506/APhysPolB.42.1333
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Komitet BadaƄ Naukowych (Poland) (KBN) , United States. National Aeronautics and Space Administration (NASA), Newton International Fellowship
Grant number: NNX07AP61G (NASA), NF090143 (Newton International Fellowship)

Data sourced from Thomson Reuters' Web of Knowledge

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