Journal ArticleDOI
Wave propagation in a magnetic cylinder
P. M. Edwin,B. Roberts +1 more
TLDR
In this article, the authors investigated the nature of oscillations in a magnetic cylinder embedded in magnetic environment and showed that the standard slender flux tube analysis of a kink mode in a cylinder excludes the possibility of a second mode, which arises under photospheric conditions.Abstract:
The nature of oscillations in a magnetic cylinder embedded in a magnetic environment is investigated. It is shown that the standard slender flux tube analysis of a kink mode in a cylinder excludes the possibility of a second mode, which arises under photospheric conditions. Under coronal conditions, two widely separated classes of oscillation can be freely sustained, one on an acoustic time-scale and the other on an Alfvenic time-scale. The acoustic-type oscillations are always present, but the much shorter period, Alfvenic-type, oscillations arise only in high density (strictly, low Alfven velocity) loops. An application to waves in fibrils is also given, and suggests (following Wentzel, 1979) that they are fast kink waves propagating in a density enhancement.read more
Citations
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Journal ArticleDOI
Corrugation Instability of a Coronal Arcade
TL;DR: In this article, the authors analyzed the behavior of linear magnetohydrodynamic perturbations of a coronal arcade modelled by a half-cylinder with an azimuthal magnetic field and non-uniform radial profiles of the plasma pressure, temperature, and the field.
Journal ArticleDOI
Kink Waves in Thin Stratified Magnetically Twisted Flux Tubes
I. Lopin,I. Nagorny +1 more
Journal ArticleDOI
Resonant absorption in dissipative flux tubes
Hossein Safari,Sadollah Nasiri,Sadollah Nasiri,Kayoomars Karami,Kayoomars Karami,Yousef Sobouti +5 more
TL;DR: In this paper, the resonant absorption of MHD waves in magnetized flux tubes with a radial density inhomogeneity was studied and the full spectrum of the eigenfrequencies and damping rates of the MHD quasi modes of the tube were analyzed.
Journal ArticleDOI
Transverse oscillation of a coronal loop induced by a flare-related jet
TL;DR: In this article, the authors reported multi-wavelength observations of the transverse oscillation of a large scale coronal loop with a length of 350 Mm. The oscillation was induced by a blowout coronal jet, which was related to a circular ribbon flare (CRF) in AR 12434 on 2015 October 16.
Journal ArticleDOI
Transverse oscillations of non-planar coronal loops
Michael S. Ruderman,A. Scott +1 more
TL;DR: In this article, a simple model of a non-planar coronal loop with torsion was proposed, where the loop axis is a part of a helical line and the boundary is a coordinate surface.
References
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Journal ArticleDOI
Elastic Waves in Layered Media
TL;DR: In this paper, Elastic Waves in Layered Media (ELMW) are used to describe the properties of layered media in a geologiska foreningen i Stockholm Forhandlingar.
Journal ArticleDOI
Wave propagation in a magnetically structured atmosphere
TL;DR: In this paper, the authors investigate the occurrence of magnetoacoustic surface waves at a single magnetic interface and consider in detail the case where one side of the interface is field-free.
Journal ArticleDOI
Wave propagation in a magnetically structured atmosphere: III: The slab in a magnetic environment
P.M. Edwin,B. Roberts +1 more
TL;DR: In this paper, the propagation of waves in a magnetic slab embedded in magnetic environment is investigated and possible modes of propagation are examined from the general dispersion relation, both analytically and numerically, for disturbances which are evanescent in the environment.