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The cross sections of solar coronal loops are suggested to be rarely circular. We examine linear kink oscillations in straight, density-enhanced, magnetic cylinders with elliptical cross-sections by solving the three-dimensional…

Solar and Stellar Astrophysics · Physics 2020-12-02 Mingzhe Guo , Bo Li , Tom Van Doorsselaere

This paper separately evaluates the effects of inclination and asymmetry of solar coronal loops on the resonant absorption of kink magnetohydrodynamic (MHD) oscillations. We modelled a typical coronal loop by a straight and axisymmetric…

Solar and Stellar Astrophysics · Physics 2021-04-06 Sirwan Amiri , Kayoomars Karami , Zanyar Ebrahimi

Kink oscillations are frequently observed in coronal loops. This work aims to numerically clarify the influence of loop curvature on horizontally and vertically polarized kink oscillations. Working within the framework of ideal MHD, we…

Solar and Stellar Astrophysics · Physics 2024-04-09 Mingzhe Guo , Tom Van Doorsselaere , Bo Li , Marcel Goossens

We model a coronal loop as a three-dimensional magnetic cylinder in a realistic solar atmosphere that extends from the chromosphere to the corona. Kink oscillations, believed ubiquitous in the solar corona, are launched in the loop. Heating…

Solar and Stellar Astrophysics · Physics 2023-05-31 Mingzhe Guo , Timothy Duckenfield , Tom Van Doorsselaere , Konstantinos Karampelas , Gabriel Pelouze , Yuhang gao

Decayless kink oscillations are frequently observed in solar coronal loops and are considered potential contributors to coronal heating. Despite the ubiquity of this wave phenomenon, its driving mechanism remains unclear. Studies to derive…

Solar and Stellar Astrophysics · Physics 2026-03-04 Sudip Mandal , Cosima Breu , Hardi Peter

Recent observations have revealed the ubiquitous presence of magnetohydrodynamic (MHD) waves and oscillations in the solar corona. The aim of this review is to present recent progress in the observational study of four types of wave (or…

Solar and Stellar Astrophysics · Physics 2018-04-02 Tongjiang Wang

There are ubiquitous flows observed in the solar atmosphere of sub-Alfv\'{e}nic speeds, however after flaring and coronal mass ejection events flows can become Alfv\'{e}nic. In this Letter, we derive an expression for the standing kink mode…

Solar and Stellar Astrophysics · Physics 2015-05-27 J. Terradas , I. Arregui , G. Verth , M. Goossens

Aims. We construct a new analytical model of a solar coronal loop that is embedded in a gravitationally stratified and magnetically confined atmosphere. On the basis of this analytical model, we devise a numerical model of solar coronal…

Solar and Stellar Astrophysics · Physics 2015-03-25 K. Murawski , A. Solov'ev , J. Kraskiewicz , A. K. Srivastava

Alfv\'enic waves have gained renewed interest since the existence of ubiquitous propagating kink waves were discovered in the corona. {It has long been suggested that Alfv\'enic} waves play an important role in coronal heating and the…

Solar and Stellar Astrophysics · Physics 2019-05-15 Ajay K. Tiwari , Richard J. Morton , Stephane Régnier , James A. McLaughlin

The detection of multiple mode harmonic kink oscillations in coronal loops enables to obtain information on coronal density stratification and magnetic field expansion using seismology inversion techniques. The inference is based on the…

Solar and Stellar Astrophysics · Physics 2015-06-15 I. Arregui , A. Asensio Ramos , A. J. Diaz

Kink oscillations of a coronal loop are observed and studied in detail because they provide a unique probe into the structure of coronal loops through MHD seismology and a potential test of coronal heating through the phase-mixing of…

Solar and Stellar Astrophysics · Physics 2018-08-29 P. Pagano , D. J. Pascoe , I. De Moortel

Kink oscillations of coronal loops, i.e., standing kink waves, is one of the most studied dynamic phenomena in the solar corona. The oscillations are excited by impulsive energy releases, such as low coronal eruptions. Typical periods of…

Context. Kink waves are routinely observed in coronal loops. Resonant absorption is a well-accepted mechanism that extracts energy from kink waves. Nonlinear kink waves are know to be affected by the Kelvin-Helmholtz instability. However,…

Solar and Stellar Astrophysics · Physics 2022-03-14 N. Magyar , T. Duckenfield , T. Van Doorsselaere , V. M. Nakariakov

Decayless kink oscillations of solar coronal loops are studied in terms of a low-dimensional model based on a randomly driven Rayleigh oscillator with coefficients experiencing random fluctuations. The model considers kink oscillations as…

Solar and Stellar Astrophysics · Physics 2022-09-28 Valery M. Nakariakov , Dmitrii Y. Kolotkov , Sihui Zhong

Loops of magnetic field in the corona are observed to oscillate and these oscillations have been posited to be the superposition of resonant kink waves. To date, most analyses of these oscillations have concentrated on calculating the…

Solar and Stellar Astrophysics · Physics 2012-09-26 Bradley W. Hindman , Rekha Jain

There is ample evidence of twisted magnetic structures in the solar corona. This motivates us to consider the magnetic twist as the cause of Alfven frequency continuum in the coronal loops, which can support the resonant absorption as a…

Solar and Stellar Astrophysics · Physics 2016-08-18 Zanyar Ebrahimi , Kayoomars Karami

We aim to study the standing fundamental kink mode of coronal loops in the nonlinear regime, investigating the changes in energy evolution in the cross-section and oscillation amplitude of the loop which are related to nonlinear effects, in…

Solar and Stellar Astrophysics · Physics 2016-11-02 N. Magyar , T. Van Doorsselaere

The propagation and the evolution of Alfvenic pulses in the solar coronal arcades is investigated by means of MHD numerical simulations. Significant transverse oscillations in coronal loops, triggered by nearby flare events, are often…

Astrophysics · Physics 2009-11-10 Luca Del Zanna , Eveline Schaekens , Marco Velli

It has been shown that resonant absorption is a robust physical mechanism to explain the observed damping of magnetohydrodynamic (MHD) kink waves in the solar atmosphere due to naturally occurring plasma inhomogeneity in the direction…

Solar and Stellar Astrophysics · Physics 2015-05-28 Roberto Soler , Jaume Terradas , Gary Verth , Marcel Goossens

Decayless kink oscillations of plasma loops in the solar corona may contain an answer to the enigmatic problem of solar and stellar coronal heating. The polarisation of the oscillations gives us a unique information about their excitation…

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