Influence of random magnetic field on solar global oscillations: The incompressible f-mode

Free access article

Issue		A&A Volume 431, Number 3, March I 2005


Page(s)		1083 - 1088
Section		The Sun
DOI		http://dx.doi.org/10.1051/0004-6361:20041456

A&A 431, 1083-1088 (2005)
DOI: 10.1051/0004-6361:20041456

Influence of random magnetic field on solar global oscillations: The incompressible f-mode

R. Erdélyi, A. Kerekes and N. Mole

Solar Physics & upper-Atmosphere Research Group, Department of Applied Mathematics, University of Sheffield, The Hicks Building, Hounsfield Road, Sheffield S3 7RH, UK
e-mail: [robertus;a.kerekes;n.mole]@sheffield.ac.uk

(Received 11 June 2004 / Accepted 23 October 2004 )

Abstract
The discrepancies between theoretically predicted and observed frequencies of solar global oscillations (e.g. p- and f-modes) have attracted major attention in the past decades. The f-mode is essentially a surface wave hence the mode frequencies are less likely to be influenced by the solar stratification. Most probably then the discrepancies are the result of some near surface mechanism(s) such as interactions with surface or sub-surface magnetic fields and flows. In the following we explore whether the small-scale photospheric magnetic fields, sometimes also called the magnetic carpet, may be part of the explanation for the apparent frequency paradox.

Key words: magnetohydrodynamics (MHD) -- Sun: helioseismology -- Sun: oscillations -- Sun: atmosphere -- Sun: magnetic fields

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