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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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Official URL: http://dx.doi.org/10.1051/0004-6361:20000027

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

Dates:

Date	Event
January 2001	Published

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)

References:

Berghmans, D., & Clette, F. 1999, Solar Phys., 186, 207
Fried, B. D., & Conte, S. D. 1961, The plasma dispersion
function (Academic, New York)
Deforest, C. E., & Gurman, J. B. 1998, ApJ, 501, L217
Berton, R., & Heyvaerts, J. 1987, Solar Phys., 109, 201
Howe, M. S. 1971, J. Fluid Mech., 45, 785
Karweit, M., & Blanc-Benon, Ph. 1995, J. Comp. Acoust., 3,
203
LeVeque, R. J. 1997, CLAWPACK user notes, University of
Seattle, WA
Li, H. S., & Zweibel, E. G. 1987, ApJ, 322, 248
Lou, Y. Q., & Rosner, R. 1986, ApJ, 309, 874
Moreton, G. F. 1961, S&T, 21, 145
Nakariakov, V. M., Ofman, L., DeLuca, E. E., Roberts, B., &
Davila, J. M. 1999, Science, 285, 862
Nocera, L., Medrek, M., & Murawski, K. 2000, A&A,
in preparation
Ofman, L., Nakariakov, V. M., & Deforest, C. E. 2000, ApJ,
514, 441
Ofman, L., Nakariakov, V. M., & Sehgal, N. 2000, ApJ, 533,
1071
Roberts, B. 1991, in Advances in Solar System
Magnetohydrodynamics, ed. E. R. Priest, & A. W. Hood
(Cambridge Univ. Press)
Roberts, B., & Ulmschneider, P. 1997, in Solar and Heliospheric
Plasma Physics, ed. G. Simnett, et al. (Springer)
Shapiro, S. A., & Kneib, G. 1993, Geophys. J. Int., 114, 373
Thompson, B. J., et al. 1999, ApJ, 517, L151
Valley, G. C. 1971, ApJ, 168, 251
Valley, G. C. 1974, ApJ, 186, 181