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Issue A&A
Volume 487, Number 2, August IV 2008
Page(s) 717 - 721
Section The Sun
DOI http://dx.doi.org/10.1051/0004-6361:20079266
Published online 09 June 2008



A&A 487, 717-721 (2008)
DOI: 10.1051/0004-6361:20079266

Vertical oscillations of an arcade loop in a gravitationally stratified solar corona

M. Gruszecki and K. Murawski

Group of Astrophysics and Gravity Theory, Institute of Physics, UMCS, ul. Radziszewskiego 10, 20-031 Lublin, Poland
    e-mail: marcingruszecki@wp.pl

Received 17 December 2007 / Accepted 9 May 2008

Abstract
Aims. We consider impulsively-generated vertical oscillations of an arcade loop that is embedded in the gravitationally-stratified solar corona.
Methods. Two-dimensional magnetohydrodynamic equations are solved numerically in the limit of an ideal plasma.
Results. The numerical results indicate that the effect of gravity produces a decrease in the wave period and an increase in the attenuation time. This decrease is a consequence of a higher Alfvén speed within the gravitationally-stratified arcade loop, while the weaker attenuation reflects a smaller amount of wave tunneling than in the gravity-free case. These results are reminiscent of those for TRACE data.


Key words: magnetohydrodynamics (MHD) -- Sun: corona -- Sun: oscillations



© ESO 2008

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