Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012a%26a...537a..96k&link_type=abstract
Astronomy & Astrophysics, Volume 537, id.A96
Astronomy and Astrophysics
Astrophysics
Magnetohydrodynamics (Mhd), Sun: Atmosphere, Sun: Oscillations
Scientific paper
Aims: We consider magnetoacoustic oscillations in a gravitationally stratified solar corona, that are triggered by an initial pulse in the vertical component of velocity launched from various altitudes of the solar atmosphere. Methods: We numerically solve two-dimensional magnetohydrodynamic equations for an ideal plasma to determine the spatial and temporal signatures of excited oscillations. Results: Our numerical results reveal that few-min oscillations are effectively excited by the initial velocity pulses and that their waveperiods depend on the vertical location and amplitude of the pulse. Conclusions: The building block of this scenario consists of a one-dimensional rebound shock model.
Movies attached to Figs. 5 and 6 are available in electronic form at http://www.aanda.org
Konkol P.
Murawski Kris
Zaqarashvili Teimuraz V.
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