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Title:
Alfven wave heating of coronal loops: photospheric excitation.
Authors:
Halberstadt, G.; Goedbloed, J. P.
Publication:
Astronomy and Astrophysics, v.301, p.559 (A&A Homepage)
Publication Date:
09/1995
Origin:
A&A via CDS; KNUDSEN
A&A Keywords:
MHD, METHODS: NUMERICAL, SUN: CORONA, MAGNETIC FIELDS, PLASMAS
Bibliographic Code:
1995A&A...301..559H

Abstract

Alfven resonant heating of bounded coronal loops is investigated numerically in a two-dimensional model. A coronal loop is modelled as a cylindrical, magnetized plasma column, that is bounded by the high density photospheric plasma. Alfven wave excitation is assumed to be due to the convective motion of the photosphere. The excitation of coronal loops at the foot points by this photospheric motion, which is not incorporated in most existing models, is the main topic in the work described here. The dynamics of the heating of coronal loops due to the excited Alfven waves is treated by numerically solving the fully resistive linearized equations of magnetohydrodynamics for the described model. In previous work (Goedbloed & Halberstadt 1994), it was shown that pure Alfven and pure fast magnetosonic waves no longer exist in bounded loops. In the present paper the general role of the fast wave component for Alfven heating is investigated. In particular, it is shown that the coupling of Alfven and fast waves gives rise to a new kind of eigenmodes, that consist of a global fast wave contribution and a localized and damped Alfven tail. These waves are efficiently excited by compressional fluid motion, and yield high Ohmic dissipation rates.

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Physics
arXiv e-prints