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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. ISSN 0587-4254
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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 |
|---|---|
| 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 |
| Volume: | Vol.42 |
| Number: | No.6 |
| Page Range: | pp. 1333-1344 |
| Identification Number: | 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) |
| URI: | http://wrap.warwick.ac.uk/id/eprint/38749 |
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