Localization of slow magnetosonic waves in the solar corona

Journal Article · Mon Jan 01 04:00:00 EST 1996 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.871865· OSTI ID:253493

Rutkevich, I M; Mond, M ^[1]

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1. The Pearlstone Center for Aeronauticad Engineering Studies, Department of Mechanical Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer Sheva 84115 (Israel)

The propagation and localization of slow magnetosonic waves (SMW) in a radially nonuniform pnasma column in the presence of an axial magnetic field are investigated. A magnetohydrodynamic (MHD) model that is appropriate for the conditions in the hot solar cor/.al loops is emrloyed. It is shown that temperature nonuniformities give rise to channeling /f the SMW along magnetic field lmnes. The eigenvalue equation for the localized SMW is eerived qnd dependencies of the axial wave numbers and of the radii of localization on the wave frequency are presented for typical solar corona conditions. It is shown that the maximal radius of localization of the SMW is smaller than the observed radii of the loops. The effects of finite ion gyrofrequency are investigated by introducing the Hall dispersion term into the ideal MHD model. It is shown that the singular behavior of the ideal MHD continuous spectrum due to the slow magnetosonic resonance is not reproduced in the limit of small wave frequency to gyrofrequency ratio. This results in an increase of the maximal radius of localization. {copyright} {ital 1996 American Institute of Physics.}

• OSTI ID: 253493
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 1 Vol. 3; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
EIGENVALUES
ION ACOUSTIC WAVES
MAGNETOACOUSTIC WAVES
MAGNETOHYDRODYNAMICS
SOLAR CORONA
WKB APPROXIMATION