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
More filters
Journal ArticleDOI
Fast magnetohydrodynamic oscillation of longitudinally inhomogeneous prominence threads: an analogue with quantum harmonic oscillator
S. N. Lomineishvili,S. N. Lomineishvili,Teimuraz V. Zaqarashvili,Teimuraz V. Zaqarashvili,Ivan Zhelyazkov,Alexander G. Tevzadze +5 more
TL;DR: In this paper, the frequency of kink waves is proportional to the expression α(2n + 1), where α is the density inhomogeneity parameter, and n the longitudinal mode number.
Journal ArticleDOI
Pre-eruption Oscillations in Thin and Long Features in a Quiescent Filament
Anand Joshi,Yoichiro Hanaoka,Yoshinori Suematsu,Satoshi Morita,Vasyl Yurchyshyn,Vasyl Yurchyshyn,Kyung-Suk Cho,Kyung-Suk Cho +7 more
TL;DR: In this article, the authors investigated the eruption of a quiescent filament located close to an active region and found that large-scale activation was observed in only half of the filament in the form of pre-eruption oscillations.
Journal ArticleDOI
Onset of 2D magnetic reconnection in the solar photosphere, chromosphere and corona
TL;DR: In this article, the authors investigate the onset of 2D time-dependent magnetic reconnection that is triggered using an external velocity driver located away from, and perpendicular to, an equilibrium Harris current sheet.
Journal ArticleDOI
Impulsively generated kink wave trains in solar coronal slabs
TL;DR: In this paper , the authors numerically follow the response of densityenhanced slabs to impulsive, localized, transverse velocity perturbations by working in the framework of ideal magnetohydrodynamics (MHD).
Journal ArticleDOI
First evidence of interaction between longitudinal and transverse waves in solar magnetic elements
TL;DR: In this paper, the authors studied the transversal and longitudinal velocity oscillations in small magnetic elements and found buffeting-induced transverse oscillations with velocity amplitudes of the order of 1-2 km/s were common along with longitudinal oscillations.
References
More filters
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.