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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
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 | ||||
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| Subjects: | Q Science > QA Mathematics Q Science > QB Astronomy Q Science > QC Physics |
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| 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: |
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| 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 Badań Naukowych (Poland) (KBN) , United States. National Aeronautics and Space Administration (NASA), Newton International Fellowship | ||||
| Grant number: | NNX07AP61G (NASA), NF090143 (Newton International Fellowship) |
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