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
Excitation of Negative Energy Surface Magnetohydrodynamic Waves in an Incompressible Cylindrical Plasma
TL;DR: In this article, the authors studied the appearance of negative energy surface waves in a plasma cylinder in the incompressible limit and derived dispersion relations, and obtained analytical solutions for the phase speed and growth rate (increment) of the waves.
Journal ArticleDOI
Kink Oscillations in Solar Coronal Loops with Elliptical Cross Sections. I. The Linear Regime
TL;DR: In this paper, linear kink oscillations in straight, density-enhanced, magnetic cylinders with elliptical cross-sections were examined from an initial-value-problem perspective, and it was shown that the apparent damping of the transverse displacement of the loop axis is accompanied by the accumulation of transverse Alfv\'enic motions and the consequent development of small scales therein.
Journal ArticleDOI
Fast Standing Modes in Transversley Nonuniform Solar Coronal Slabs: The Effects of a Finite Plasma Beta
TL;DR: In this article, the dispersion relation governing fast waves in coronal slabs for which the continuous transverse distributions of the physical parameters comprise a uniform core, a uniform external medium, and a transition layer (TL) in between.
Journal ArticleDOI
Transverse oscillation of a coronal loop induced by a flare-related jet
TL;DR: In this article, a large-scale coronal loop with a length of ≥ 350 Mm was observed by a blowout coronal jet, which was related to a C4.2 circular-ribbon flare (CRF) in active region 12434 on 2015 October 16.
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.