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
Coronal Leaky Tube Waves and Oscillations Observed with Trace
TL;DR: In this paper, the authors examined leaky tube waves in the context of kink oscillations in coronal loops, observed in recent years using TRACE and pointed out that the standard (non-leaky) principal kink mode has a leaky bifurcated counterpart with decay time τl≈4π−4(L/R)2P, where R and L are the loop radius and length, and P is the oscillation period.
Journal ArticleDOI
Damping of slow magnetoacoustic oscillations by the misbalance between heating and cooling processes in the solar corona
Dmitrii Y. Kolotkov,Valery M. Nakariakov,Valery M. Nakariakov,D. I. Zavershinskii,D. I. Zavershinskii +4 more
TL;DR: In this paper, the effect of damping of standing slow magnetoacoustic oscillations in the solar coronal loops is investigated accounting for field-aligned thermal conductivity and a wave-induced misbalance between radiative cooling and some unspecified heating rates.
Journal ArticleDOI
Direct and Inverse Cascades in the Acceleration Region of the Fast Solar Wind
TL;DR: In this paper, the authors used reduced magnetohydrodynamic (RMHD) simulations to investigate how the cascade rates of the fast solar wind depend on the radial distance from the Sun center.
Journal ArticleDOI
Spatial damping of propagating kink waves due to resonant absorption: effect of background flow
TL;DR: In this paper, the authors investigated the effect of the longitudinal background on the propagation and spatial damping of kink waves in transversely nonuniformmagnetic flux tubes.
Journal ArticleDOI
High-frequency Oscillations in Small Magnetic Elements Observed with Sunrise/SuFI
Shahin Jafarzadeh,Sami K. Solanki,Sami K. Solanki,Marco Stangalini,Oskar Steiner,Robert H. Cameron,Sanja Danilovic +6 more
TL;DR: In this article, the wavelet transform was used to analyze the wave propagation in the lower solar atmosphere from observations at high spatial and temporal resolution, which revealed upward propagating waves at high frequency up to 30 mHz.
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.