Numerical simulations of vertical oscillations  of a solar coronal loop

Selwa, M.; Murawski, K.; Solanki, S. K.; Wang, T. J.; Tóth, G.

doi:10.1051/0004-6361:20053121

Cited by 42 publications

(51 citation statements)

References 21 publications

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“…For the mass density contrast, we choose d = i / e = 10, where i denotes the mass density within the loop and e corresponds to the ambient medium. This density contrast was chosen to remain consistent with our earlier computations (Selwa et al 2005(Selwa et al , 2007a. Note that the Alfvén speed within the loop is smaller than in the ambient medium (…”

Section: Equilibrium Configurationsmentioning

confidence: 96%

“…We adopt and modify the coronal arcade model described in Selwa et al (2005Selwa et al ( , 2006Selwa et al ( , 2007a. In this model, the coronal arcade is embedded in a two-dimensional motionless environment (V e = 0; all variables referring to the environment are denoted by subscript "e") in which mass density e = const and gas pressure p e = e c 2 se /γ has to be constant.…”

Section: Equilibrium Configurationsmentioning

confidence: 99%

“…In this model, the Alfvén speed in the environment is given by V Ae = |B e |/ √ μ e . Following Selwa et al (2005Selwa et al ( , 2006Selwa et al ( , 2007a we model a denser loop that is embedded in the arcade in such a way that its edges follow two specific magnetic field lines. We choose x f = ±0.7 L as footpoints of the loop and w = 0.0125 L as its half-width at the footpoints.…”

Section: Equilibrium Configurationsmentioning

confidence: 99%

“…The current work is motivated by the rapid attenuation of magnetohydrodynamic waves through leakage found by Selwa et al (2005Selwa et al ( , 2006Selwa et al ( , 2007a and Gruszecki et al (2006Gruszecki et al ( , 2008 in earlier 2D simulations. The simulated oscillations are damped considerably more rapidly than the observed oscillations.…”

Section: Introductionmentioning

confidence: 99%

“…They found that the maximum wave period, which can successfully be excited by the footpoint driving mechanism, corresponds to the fifth harmonic of the loop. In this paper, we extend the approaches of both Selwa et al (2005Selwa et al ( , 2006Selwa et al ( , 2007a and Brady & Arber (2005) by perturbing the loop with an oscillatory pressure that acts on the whole loop from the ambient medium. Ballai et al (2008) studied kink waves in straight cylindrical loop excited by EIT waves.…”

Section: Introductionmentioning

confidence: 99%

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Excitation of vertical kink waves in a solar coronal arcade loop by a periodic driver

Selwa

Murawski

Solanki

et al. 2010

A&A

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Aims. We study an oscillatory driver as a possible excitation mechanism of vertical kink loop oscillations in the ideal MHD regime. Methods. We consider a solar coronal magnetic arcade with a dense photospheric layer. The two-dimensional numerical model that we implement includes the effects of nonlinearity and line curvature on the excitation and attenuation of fast magnetosonic kink waves. We investigate the effects of a driven sinusoidal pressure pulse and compare it with the impulsive excitation by a pressure pulse that impacts the overlying loop. Results. Our numerical simulations reveal wave signatures that are reminiscent of vertical loop oscillations seen in TRACE observational data. Conclusions. We conclude that attenuation of vertical kink oscillations can be reduced to the value observed by adopting an oscillatory instead of an impulsive excitation. An oscillatory driver also naturally explains why only a small subset of all loops is excited to oscillate transversally in an active region.

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Section: Equilibrium Configurationsmentioning

confidence: 96%

Section: Equilibrium Configurationsmentioning

confidence: 99%

Section: Equilibrium Configurationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Excitation of vertical kink waves in a solar coronal arcade loop by a periodic driver

Selwa

Murawski

Solanki

et al. 2010

A&A

Self Cite

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A viscous magnetohydrodynamic Kelvin–Helmholtz instability in the interface of two fluid layer: Part II. An application to the atmosphere of the Sun

Çavuş

Hoshoudy

2019

Astrophys Space Sci

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The main aim of this submission is to investigate the effects of some parameters like wave number, shear velocity, magnetic field and temperature for the growth rate of the magnetized Kelvin-Helmholtz instability (KHI) with incessant profiles through interface of two viscous fluid layer occurred in the solar atmosphere using the model of Hoshoudy, Cavus and Mahdy (2019). In this examination, the presence of KHI is identified for the various cases of wave number, magnetic field, shear velocity and temperature in the solar atmosphere. The sensible values of these parameters were acquired.

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Failed Eruption of a Filament as a Driver for Vertical Oscillations of Coronal Loops

Mrozek

2011

Sol Phys

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We present observations of a failed eruption of a magnetic flux rope recorded during the M6.2 flare of 14 July 2004. The observations were mainly made with TRACE 171 Å and 1600 Å filters. The flare was accompanied by a destabilization of a magnetic structure observed as a filament eruption. After an initial acceleration, the eruption slowed down and finally was stopped by the overlying coronal loops. The observations suggest that the whole event is well described by the quadrupole model of a solar flare. The failed eruption stretched the overlying loops, and they were then observed to be oscillating. We were able to observe clear vertical polarization of the oscillatory motion in the TRACE images. The derived parameters of the oscillatory motion are an initial amplitude of 9520 km, a period of 377 s, and an exponential damping time of 500 s. Differences between the existing models and the observations have been found. The analyzed event is the second sample for global vertical kink waves found besides the first by Wang and Solanki (Astrophys.

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Numerical simulations of vertical oscillations of a solar coronal loop

Cited by 42 publications

References 21 publications

Excitation of vertical kink waves in a solar coronal arcade loop by a periodic driver

Excitation of vertical kink waves in a solar coronal arcade loop by a periodic driver

A viscous magnetohydrodynamic Kelvin–Helmholtz instability in the interface of two fluid layer: Part II. An application to the atmosphere of the Sun

Failed Eruption of a Filament as a Driver for Vertical Oscillations of Coronal Loops

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