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
Dissipating the energy of magnetoacoustic waves in a structured atmosphere
TL;DR: In this paper, the distances over which magnetohydrodynamic waves will propagate in a non-ideal, magnetic, compressible medium, representing the solar corona structured by the presence of loops of denser material, are considered.
Journal ArticleDOI
High-frequency oscillations in small chromospheric bright features observed with ALMA
Juan Camilo Guevara Gómez,Shahin Jafarzadeh,Sven Wedemeyer,Mikolaj Szydlarski,Marco Stangalini,Bernhard Fleck,P. H. Keys +6 more
TL;DR: In this paper, the Atacama Large Millimeter/submillimeter Array (ALMA) was used for high-cadence observations with high-frequency magnetohydrodynamic waves in the solar chromosphere.
Dissertation
Magnetohydrodynamic waves in a gravitationally stratified fluid
TL;DR: In this paper, the role of buoyancy in the propagation of magnetohydrodynamic (MHD) waves in a gravitationally stratified medium has been investigated, and it has been shown that the global resonance is a rather robust phenomenon and may be an important mechanism in supplying energy into the higher solar atmosphere.
Journal ArticleDOI
Resonant damping of kink oscillations of thin expanding magnetic tubes
TL;DR: In this article, the authors studied the resonant damping of kink oscillations of thin expanding magnetic flux tubes and showed that under the condition of homogeneous stratification, the ratio of the decrement to the oscillation frequency is independent of a particular form of the density variation along the tube.
Journal ArticleDOI
Fast Standing Modes in Transversely Nonuniform Solar Coronal Slabs: Effects of a Finite Plasma Beta
TL;DR: In this paper, the dispersive properties of linear fast standing modes in transversely nonuniform solar coronal slabs with finite gas pressure, or, equivalently, finite plasma beta, were examined.
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.