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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Magnetoacoustic wave propagation in off-limb polar regions
TL;DR: In this paper, the phase delays between flux and velocity oscillations between different line pairs, when plotted over a −180 to +180 range, line up along diagonal lines corresponding to measurable and fixed time delays.
Book
MHD Waves in the Solar Atmosphere
TL;DR: In this paper, the authors present a full mathematical exposition of the growing field of coronal seismology which will prove invaluable for graduate students and researchers alike, drawing upon the principles of fluid mechanics and electromagnetism, as well as observations from the TRACE and SDO spacecraft.
Journal ArticleDOI
Damping of filament thread oscillations: effect of the slow continuum
TL;DR: In this article, the effect of the slow continuum on the damping of transverse thread oscillations was explored for the first time both analytically and numerically. But the results showed that the effect was limited to the case of a straight cylindrical plasma, an inhomogeneous transitional layer and the homogeneous coronal plasma.
Journal ArticleDOI
Amplitudes and Energy Fluxes of Simulated Decayless Kink Oscillations
TL;DR: In this paper, the authors investigate the correlation between the observed amplitudes of the oscillations and input the energy flux from different drivers, and find that low amplitude decayless kink oscillations may correspond to significant energy fluxes of the order of the radiative losses for the Quiet Sun.
Journal ArticleDOI
Multi-instrument observations of a failed flare eruption associated with MHD waves in a loop bundle
TL;DR: In this paper, a B7.9 class flare was observed to trigger an eruption of a dense cool plasma blob as seen in AIA 171A which is unable to completely break out and remains confined within a local bundle of active region loops.
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.