Global oscillations in a magnetic solar model. II. Oblique propagation

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dc.contributor.author Pintér, Balázs
dc.contributor.author Goossens, M.
dc.contributor.author Erdélyi, R.
dc.date.accessioned 2007-10-11T09:37:34Z
dc.date.available 2007-10-11T09:37:34Z
dc.date.issued 2007-10-11
dc.identifier.citation Pintér , B , Goossens , M & Erdélyi , R 2007 , ' Global oscillations in a magnetic solar model. II. Oblique propagation ' Astronomy and Astrophysics , pp. 377-388 . en
dc.identifier.other PURE: 81335
dc.identifier.other dspace: 2160/339
dc.identifier.uri http://hdl.handle.net/2160/339
dc.description Pintér, B.; Erdélyi, R.; Goossens, M., Global oscillations in a magnetic solar model. II. Oblique propagation, Astronomy and Astrophysics, Volume 466, Issue 1, April IV 2007, pp.377-388 en
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
dc.format.extent 12 en
dc.language.iso eng
dc.relation.ispartof Astronomy and Astrophysics en
dc.title Global oscillations in a magnetic solar model. II. Oblique propagation en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.contributor.institution Institute of Mathematics & Physics (ADT) en
dc.description.status Peer reviewed en


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