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
Sausage oscillations of coronal plasma slabs
Crystal A. Hornsey,Crystal A. Hornsey,Valery M. Nakariakov,Valery M. Nakariakov,Valery M. Nakariakov,Andrzej Fludra +5 more
TL;DR: In this paper, the authors performed parametric studies of sausage oscillations of plasma slabs, aiming to determine the dependence of the oscillation period on its parameters, and the onset of leaky and trapped regimes of the sausage oscillation.
Journal ArticleDOI
The Effect of a Twisted Magnetic Field on the Period Ratio P(1)/P(2) of Nonaxisymmetric Magnetohydrodynamic Waves
Kayoomars Karami,K. Bahari +1 more
TL;DR: In this paper, the dispersion relation of nonaxisymmetric magnetohydrodynamic (MHD) modes in a zero-beta cylindrical compressible thin magnetic flux tube modeled as a twisted core surrounded by a magnetically twisted annulus, with both embedded in a straight ambient external field was derived and solved analytically and numerically.
Journal ArticleDOI
Bayesian Magnetohydrodynamic Seismology of Coronal Loops
TL;DR: In this article, a Bayesian approach was adopted to infer the most probable values of the relevant parameters, for given observed periods and damping times, and to extract their confidence levels.
Journal ArticleDOI
Magnetohydrodynamic Fast Sausage Waves in the Solar Corona.
Bo Li,Patrick Antolin,Mingzhe Guo,Alexey A. Kuznetsov,D. J. Pascoe,T. Van Doorsselaere,S. Vasheghani Farahani +6 more
TL;DR: In this paper, the dispersion properties of magnetohydrodynamic fast sausage modes (FSMs) in the canonical configuration where the equilibrium quantities are transversely structured in a step fashion are summarized.
Journal ArticleDOI
Effect of partial ionization on wave propagation in solar magnetic flux tubes
TL;DR: In this article, the impact of partial ionization on MHD wave propagation in cylindrical flux tubes in a two-fluid model was investigated and the general dispersion relation that takes into account the effects of neutral-ion collisions and the neutral gas pressure was derived.
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.