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Collisional and viscous damping of MHD waves in partially ionized plasmas of the solar atmosphere

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Khodachenko, M. L., Arber, T. D., Rucker, H. O. (Helmut O.) and Hanslmeier, Arnold. (2004) Collisional and viscous damping of MHD waves in partially ionized plasmas of the solar atmosphere. Astronomy & Astrophysics, Vol.422 (No.3). pp. 1073-1084. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361:20034207

Abstract

Magnetohydrodynamic (MHD) waves are widely considered as a possible source of heating for various parts of the outer solar atmosphere. Among the main energy dissipation mechanisms which convert the energy of damped MHD waves into thermal energy are collisional dissipation(resistivity) and viscosity. The presence of neutral atoms in the partially ionized plasmas of the solar photosphere, chromosphere and prominences enhances the eﬃciency of both these energy dissipation mechanisms. A comparative study of the eﬃciency of MHD wave damping in solar plasmas due to collisional and viscous energy dissipation mechanisms is presented here. The damping rates are taken from Braginskii 1965 and applied to the VAL C model of the quiet Sun (Vernazza et al. 1981). These estimations show which of the mechanisms are dominant in which regions. In general the correct description of MHD wave damping requires the consideration of all energy dissipation mechanisms via the inclusion of the appropriate terms in the generalized Ohm’s law, the momentum, energy and induction equations. Specific forms of the generalized Ohm’s Law and induction equation are presented that are suitable for regions of the solar atmosphere which are partially ionised.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Magnetohydrodynamic waves, Solar chromosphere, Solar photosphere
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Date:	August 2004
Volume:	Vol.422
Number:	No.3
Page Range:	pp. 1073-1084
Identification Number:	10.1051/0004-6361:20034207
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	British Academy (BA), British Council (Austria), Österreichischer Auslandsstudentendienst , Rossiĭskiĭ fond fundamentalŉykh issledovaniĭ [Russian Foundation for Basic Research] (RFFI), Österreichische Akademie der Wissenschaften [Austrian Academy of Sciences]
Grant number:	I.21/04 (ÖAD-RFBR), FWF (P16919-N08) (OAW)
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URI:	http://wrap.warwick.ac.uk/id/eprint/3598