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
Large scale coherent magnetohydrodynamic oscillations in a sunspot
Marco Stangalini,Gary Verth,Viktor Fedun,Alwaleed Aldhafeeri,David B. Jess,Shahin Jafarzadeh,P. H. Keys,Bernhard Fleck,Jaume Terradas,Mariarita Murabito,Ilaria Ermolli,Roberto Soler,Fabrizio Giorgi,Conor D. MacBride +13 more
TL;DR: In this paper , the largest-scale coherent oscillations observed in a sunspot, with a spectrum significantly different from the Sun's global acoustic oscillations, incorporating a superposition of many resonant wave modes.
Book ChapterDOI
Review of the Magnetohydrodynamic Waves and Their Stability in Solar Spicules and X-Ray Jets
TL;DR: De Pontieu et al. as discussed by the authors showed that spicules can carry photospheric energy into the corona and therefore can be of importance in coronal heating, and used the observed waves as a tool for spicule seismology.
Proceedings ArticleDOI
Kelvin–Helmholtz instability in coronal mass ejections and solar surges
TL;DR: In this article, the authors studied the instability of magnetohydrodynamic (MHD) waves propagating in the solar atmosphere and showed that the instability can be explained in terms of unstable m = −3 MHD mode.
Journal ArticleDOI
Magnetohydrodynamic seismology of solar and stellar coronae
TL;DR: In this article, a review of long period (longer than a few seconds) wave and oscillation phenomena in the corona of the Sun in radio, VL, EUV and X-ray bands, interpreted in terms of MHD theory is presented.
Journal ArticleDOI
Large scale coherent magnetohydrodynamic oscillations in a sunspot
Marco Stangalini,Gary Verth,Viktor Fedun,Alwaleed Aldhafeeri,David B. Jess,Shahin Jafarzadeh,P. H. Keys,Bernhard Fleck,Jaume Terradas,Mariarita Murabito,Ilaria Ermolli,Roberto Soler,Fabrizio Giorgi,Conor D. MacBride +13 more
TL;DR: In this paper , the largest-scale coherent oscillations were observed in a sunspot, with a spectrum significantly different from the Sun's global acoustic oscillations, incorporating a superposition of many resonant wave modes.
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.