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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Mathematical Models of Quiescent Solar Prominences
TL;DR: McKaig and Adam as mentioned in this paper modeled the convection zone as both one-dimensional and more realistically, two-dimensional, and solved the Dirichlet problem on a semi-infinite strip using conformal map-pings and the method of images.
Journal ArticleDOI
Kelvin-Helmholtz instability in coronal magnetic flux tubes due to azimuthal shear flows
TL;DR: In this article, the authors investigate the linear stage of the kink instability in a cylindrical magnetic flux tube in the presence of azimuthal shear motions and find that fluting-like modes can develop a KHI in time-scales comparable to the period of kink oscillations of the flux tube.
Dissertation
Magnetohydrodynamic oscillations in solar coronal rain
TL;DR: In this article, the authors combine high-resolution observations and numerical simulations to understand the interplay between coronal rain and MHD oscillations, and find that flows with realistic speeds are sufficient to excite oscillations with observable amplitudes.
Journal ArticleDOI
Nonlinear effects in resonant layers in solar and space plasmas
TL;DR: In this article, a review of recent advances in the theory of nonlinear driven magnetohydrodynamic (MHD) waves in slow and Alfven resonant layers is presented, which shows that in the vicinity of resonant positions the amplitude of variables can grow over the threshold where linear descriptions are valid.
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.