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Fast magnetoacoustic waves in a randomly structured solar corona

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Murawski, K., Nakariakov, V. M. (Valery M.) and Pelinovskiĭ, E. N.. (2001) Fast magnetoacoustic waves in a randomly structured solar corona. Astronomy & Astrophysics, Vol.366 (No.1). pp. 306-310. ISSN 0004-6361

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Abstract

The propagation of fast magnetoacoustic waves in a randomly structured solar corona is considered in the linear and cold plasma limits. The random field is assumed to be static and associated with plasma density inhomogeneities only. A transcendental dispersion relation for the fast magnetoacoustic waves which propagate perpendicularly to the magnetic field is derived in the weak random field approximation. It is shown analytically that the fast magnetosonic waves experience acceleration, attenuation, and dispersion in comparison to the homogeneous case. These analytical findings are essentially confirmed by numerical simulations for a wide-spectrum pulse, except that the waves were found decelerated. It is concluded that the coronal Moreton waves can be applied to MHD seismology of the solar corona.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Magnetohydrodynamic waves -- Mathematical models, Oscillations -- Mathematical models, Sun -- Corona -- Magnetic fields, Plasma astrophysics
Journal or Publication Title: Astronomy & Astrophysics
Publisher: EDP Sciences
ISSN: 0004-6361
Official Date: January 2001
Volume: Vol.366
Number: No.1
Page Range: pp. 306-310
Identification Number: 10.1051/0004-6361:20000027
Status: Peer Reviewed
Access rights to Published version: Open Access
Funder: Komitet Badań Naukowych (Poland) (KBN), North Atlantic Treaty Organization (NATO), International Association for the Promotion of Co-operation with Scientists from the Independent States of the Former Soviet Union (INTAS)
Grant number: 2 PO3D 017 17 (KBN), PST.CLG.976135 (NATO), 97 31931 (INTAS)
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URI: http://wrap.warwick.ac.uk/id/eprint/3721

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