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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Flux tube texture of the solar wind: Strands of the magnetic carpet at 1 AU?
TL;DR: In this article, it is argued that the inner heliosphere is filled with a network of entangled magnetic flux tubes and that the flux tubes are fossil structures that originate at the solar surface.
Journal ArticleDOI
TIME-DISTANCE SEISMOLOGY OF THE SOLAR CORONA WITH CoMP
Steven Tomczyk,Scott W. McIntosh +1 more
TL;DR: In this paper, a sequence of Doppler images obtained with the Coronal Multi-Channel Polarimeter (CoMP) instrument was used to perform time-distance seismology of the solar corona.
Journal ArticleDOI
Detection of Waves in the Solar Corona: Kink or Alfvén?
TL;DR: In this article, the authors demonstrate that the observational findings can be explained in terms of guided kink magnetoacoustic modes, which is inconsistent with MHD wave theory and explain the omnipresence of waves in the corona using CoMP instrument.
Journal ArticleDOI
Resonant behaviour of MHD waves on magnetic flux tubes. III : effect of equilibrium flow
TL;DR: In this article, the conservation laws and jump conditions at Alfven and slow resonance points obtained by Sakurai et al. were generalized to include an equilibrium flow, and the assumption that the Eulerian perturbation of total pressure is constant was recovered as the special case of the conservation law for an equilibrium with straight magnetic field lines.
Journal ArticleDOI
Hot coronal loop oscillations observed by SUMER: Slow magnetosonic wave damping by thermal conduction
Leon Ofman,Tongjiang Wang +1 more
TL;DR: In this paper, the authors used a one-dimensional MHD code to model the Doppler shift oscillations and the damping of slow magnetosonic waves in a model coronal loop and found that the decay time due to compressive viscosity alone is an order of magnitude longer than the observed decay times.
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.