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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Dispersion of Slow Magnetoacoustic Waves in the Active Region Fan Loops Introduced by Thermal Misbalance
TL;DR: In this article, the effect of misbalance on waves inside the magnetic-flux tube under the second-order thin-fluency-tube approximation was studied, and it was shown that neglecting thermal misbalance may be the reason for the substantial divergence between seismological and spectrometric estimations of plasma parameters.
Journal ArticleDOI
The theory of Alfvén surface waves
TL;DR: In this article, the effects of non-ideal terms on the dispersion relation of magnetohydrodynamic surface waves in non-uniform, magnetised plasmas are examined.
Journal ArticleDOI
Slow nonlinear waves in magnetic flux tubes
Yu. D. Zhugzhda,Yu. D. Zhugzhda +1 more
TL;DR: In this paper, a theory of weakly nonlinear slow waves in magnetic flux tubes is developed in the ideal MHD approximation, and approximate dispersion relations are derived that are valid for waves of arbitrary wavelength.
Journal ArticleDOI
The effect of density stratification on the resonant absorption of MHD waves in coronal loops
TL;DR: In this article, the standing quasi-modes of the ideal magnetohydrodynamics in a zero-β cylindrical magnetic flux tube that undergoes a longitudinal density stratification and radial density structuring are considered.
Journal ArticleDOI
Stability and mode analysis of solar coronal loops using thermodynamic irreversible energy principles
Andrea Costa,Rafael Gonzalez +1 more
TL;DR: In this paper, the modes and stability of non-isothermal coronal loop models with different intensity values of the equilibrium magnetic field were studied and the feasibility of wave-based and flow-based models was 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.