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
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Dissertation
Effect of structuring on coronal loop oscillations
TL;DR: In this article, the effect of introducing inhomogeneities on the frequency of coronal MHD wave propagation was studied, and the results indicated that the source of these oscillations appears very localised in space and the driver only acts for a few periods, suggesting the perturbations are driven by leaky p-modes (solar surface modes).
Journal ArticleDOI
Non-linear propagation of kink waves to the solar chromosphere
TL;DR: In this article, the authors analyzed spectropolarimetric data of high-quality and long duration of a photospheric quiet Sun region observed near the disk center with the spectropholarimeter CRISP at the Swedish Solar Telescope (SST), and complemented by simultaneous and co-spatial broad-band chromospheric observations of the same region.
Journal ArticleDOI
Inferring physical parameters in solar prominence threads
TL;DR: In this article, a comparison between magnetohydrodynamic (MHD) models and observations is made for transverse oscillations in threads through the comparison between MHD models and observation.
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The dynamics and observability of circularly polarized kink waves
TL;DR: In this article , the properties of circularly polarized kink waves on straight plasma cylinders, for both standing and propagating waves, and compare them to those of linearly polarized Kink waves were studied.
Guided MHD waves as a coronal diagnostic tool
TL;DR: In this article, a description of how fast magnetoacoustic waves are ducted along regions of low velocity (high density) in the corona, exhibiting a distinctive wave signature which may be used as a diagnostic probe of in situ coronal conditions (magnetic field strength, density inhomogeneity, etc.).
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.