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
Estimation of spicule magnetic field using observed mhd waves by the hinode sot
TL;DR: In this paper, the authors used the high resolution Ca II H line (3968.5 ˚A) images observed by the Hinode SOT and considered a vertical thin flux tube as a spicule model.
Journal ArticleDOI
Coronal EUV, QFP, and kink waves simultaneously launched during the course of jet-loop interaction
TL;DR: In this paper, the authors present the observations of an extreme ultraviolet (EUV) wave, a quasi-periodic fast-propagating (QFP) magnetosonic wave, and a kink wave that were simultaneously associated with the impingement of a coronal jet upon a group of coronal loops.
Journal ArticleDOI
Oscillations on Width and Intensity of Slender Ca II H Fibrils from Sunrise/SuFI
R. Gafeira,Shahin Jafarzadeh,Sami K. Solanki,Andreas Lagg,M. van Noort,Peter Barthol,J. Blanco Rodríguez,J. C. del Toro Iniesta,Achim Gandorfer,Laurent Gizon,Johann Hirzberger,M. Knölker,D. Orozco Suárez,Tino L. Riethmüller,Wolfgang Schmidt +14 more
TL;DR: In this paper, the detection of oscillations in slender Ca II H fibrils (SCFs) from high-resolution observations acquired with the Sunrise balloon-borne solar observatory was reported.
Journal ArticleDOI
Sausage Oscillations in Multishell Coronal Structures
TL;DR: In this paper, the effect of fine multilayered structuring on the resonant periods of global sausage (m=0), fast magnetoacoustic oscillations of coronal loops is studied for the straight magnetic slab model filled with a zero-β plasma.
Journal ArticleDOI
Coronal loop oscillations: energy considerations and initial value problem
TL;DR: In this article, the amplitude and energy of the magnetic tube for different kinds of initial excitations have been studied and it was shown that fluting modes have quite small energies in comparison with the kink mode (around three orders of magnitude for the first fluting mode).
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.