Show simple item record Balázs en_US R. en_US M. en_US 2008-12-04T16:10:25Z 2008-12-04T16:10:25Z 2007-04 en_US
dc.identifier en_US
dc.identifier.citation Pintér , B , Erdélyi , R & Goossens , M 2007 , ' Global oscillations in a magnetic solar model : II Oblique propagation ' Astronomy and Astrophysics , vol 466 , no. 1 , pp. 377-388 . , 10.1051/0004-6361:20041632 en_US
dc.identifier.other PURE: 90276 en_US
dc.identifier.other dspace: 2160/1376 en_US
dc.description.abstract The coupling of solar global acoustic oscillations to a magnetised solar atmosphere is studied here. The solar interior - atmosphere interface is modelled by a non-magnetic polytrope interior overlayed by a planar atmosphere embedded in non-uniform horizontal atmospheric magnetic field. Pintér & Goossens (1999, A&A, 347, 321) showed that parallel propagating acoustic waves can couple resonantly to local magnetohydrodynamic (MHD) slow continuum modes only. In general, global acoustic modes can, however, propagate in arbitrary directions with respect to local atmospheric fields giving rise to an additional efficient coupling mechanism that has consequences on mode damping and atmospheric energetics. In this paper we study obliquely propagating global modes that can couple also to local MHD Alfvén continuum modes. The atmospheric magnetic effects on global mode frequencies are still much of a debate. In particular, the resulting frequency shifts and damping rates of global modes caused by the resonant interaction with both local Alfvén and slow waves are investigated. We found the coupling of global f and p modes and the Lamb mode, that penetrate into the magnetic solar atmosphere, will strongly depend on the direction of propagation with respect to the solar atmospheric magnetic field. These frequency shifts, as a function of the propagation direction, give us a further elegant tool and refinement method of local helioseismology techniques. Finally we briefly discuss the importance of studying obliquely propagating waves and discuss the results in the context of possible helioseismic observations. en_US
dc.format.extent 12 en_US
dc.relation.ispartof Astronomy and Astrophysics en_US
dc.title Global oscillations in a magnetic solar model en_US
dc.contributor.pbl Institute of Mathematics & Physics (ADT) en_US
dc.contributor.pbl Mathematics and Physics en_US

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