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

M. Gruszecki, K. Murawski, A. G. Kosovichev, K. V. Parchevsky, T. Zaqarashvili

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

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 Pac of the chromosphere. Impulses launched deeper within a low region of the stellar atmosphere result in a wake of smaller Pac. They form quasiperiodic 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.

Original languageEnglish (US)
Pages (from-to)1333-1344
Number of pages12
JournalActa Physica Polonica B
Volume42
Issue number6
DOIs
StatePublished - Jun 1 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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