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
Numerical simulations of transverse oscillations in radiatively cooling coronal loops
TL;DR: In this paper, the influence of radiative cooling on the standing kink oscillations of a coronal loop was investigated using the FLASH code, and the results showed that cooling leads to an amplification of the oscillation amplitude.
Journal ArticleDOI
The period ratio for kink and sausage modes in a magnetic slab
Cicely K. Macnamara,B. Roberts +1 more
TL;DR: In this article, the authors consider the period ratio for the fast kink and sausage modes of a magnetic slab, discussing both an Epstein density profile and a simple step function profile.
Journal ArticleDOI
Seismology of contracting and expanding coronal loops using damping of kink oscillations by mode coupling
D. J. Pascoe,Alexander Russell,Sergey Anfinogentov,Paulo J. A. Simões,Christopher R. Goddard,Valery M. Nakariakov,Lyndsay Fletcher +6 more
TL;DR: In this paper, a kink oscillation damped by mode coupling was used to model the motion of coronal loops and to calculate plasma parameters of the oscillating loops including the transverse density profile, magnetic field strength, and phase mixing timescale.
Journal ArticleDOI
Observations of X-ray oscillations in XI Boo: Evidence of a fast kink mode in the stellar loops
J. C. Pandey,A. K. Srivastava +1 more
TL;DR: In this article, the observations of X-ray oscillations during the flare in a cool active star XI Boo for the first time were reported and interpreted as a fundamental fast-kink mode of magnetoacoustic waves.
Journal ArticleDOI
Wave heating in gravitationally stratified coronal loops in the presence of resistivity and viscosity
TL;DR: In this paper, the authors studied the sites of energy dissipation from transverse waves in coronal loops in the presence and absence of gravitational stratification and compared ideal, resistive, and viscous MHD.
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.