Title:	Alfven-like mode in partially ionized solar atmosphere
Authors:	Singh, K.A.P. Krishnan, Vinod
Keywords:	Solar oscillations MHD MHD waves
Issue Date:	Jan-2010
Publisher:	Elesvier B.V.
Citation:	New Astronomy, 2010, Vol.15, p119
Abstract:	The partially ionized part of the solar atmosphere is investigated within the framework of a single-fluid magnetohydrodynamic (MHD) description including the non-ideal effects such as the Hall effect and the ambipolar diffusion in the generalized Ohm’s Law. In this paper, we study the propagation and damping of an Alfvén-like mode in the partially ionized solar atmosphere. It is found that the Hall effect, in addition to introducing strong dispersion, breaks the symmetry between the co- and the counter-propagating wave modes at the length scale approaching the Hall length-scale. The Hall effect creates short wavelength mode with circular polarization. The damping of Alfvén- like mode, in a partially ionized solar atmosphere, is found to be caused mainly by the Coulomb and the Cowling diffusivity. A comparison of the Hall ðgHÞ, the Cowling ðgAÞ and the Coulomb ðgÞ diffusivities shows that the ambipolar effect is dominant beyond the height of 175 km above the solar surface, for the solar model given by Cox (2000) [Cox, A.N., 2000. Allen’s Astrophysical Quantities, fourth ed. Springer, New York] and chosen magnetic field.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/4113
ISSN:	1384-1076
Alternative Location:	http://adsabs.harvard.edu/abs/2010NewA...15..119S http://dx.doi.org/ 10.1016/j.newast.2009.05.013
Copyright:	2010 Elesvier B.V.
Appears in Collections:	Research Papers (A&A)

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