Propagating Kink Waves in an Open Coronal Magnetic Flux Tube with Gravitational Stratification: Magnetohydrodynamic Simulation and Forward Modelling
arXiv:2406.19474 · doi:10.1051/0004-6361/202450769
Abstract
Context. In the coronal open-field regions, such as coronal holes, there are many transverse waves propagating along magnetic flux tubes, generally interpreted as kink waves. Previous studies have highlighted their potential in coronal heating, solar wind acceleration, and seismological diagnostics of various physical parameters. Aims. This study aims to investigate propagating kink waves, considering both vertical and horizontal density inhomogeneity, using three-dimensional magnetohydrodynamic (MHD) simulations. Methods. We establish a 3D MHD model of a gravitationally stratified open flux tube, incorporating a velocity driver at the lower boundary to excite propagating kink waves. Forward modelling is conducted to synthesise observational signatures of the Fe ix 17.1 nm line. Results. It is found that resonant absorption and density stratification both affect the wave amplitude. When diagnosing the relative density profile with velocity amplitude, resonant damping needs to be properly considered to avoid possible underestimation. In addition, unlike standing modes, propagating waves are believed to be Kelvin-Helmholtz stable. In the presence of vertical stratification, however, phase mixing of transverse motions around the tube boundary can still induce small scales, partially dissipating wave energy and leading to a temperature increase, especially at higher altitudes. Moreover, forward modeling is conducted to synthesise observational signatures, revealing the promising potential of future coronal imaging spectrometers such as MUSE in resolving these wave-induced signatures. Also, the synthesised intensity signals exhibit apparent periodic variations, offering a potential method to indirectly observe propagating kink waves with current EUV imagers.
accepted for publication in A&A
References in corpus (37)
- PLUTO: a Numerical Code for Computational Astrophysics
- The Solar Orbiter mission -- Science overview
- Alfven Waves in the Lower Solar Atmosphere
- Prevalence of Small-scale Jets from the Networks of the Solar Transition Region and Chromosphere
- High Resolution Observations and Modeling of Dynamic Fibrils
- Persistent Doppler shift oscillations observed with HINODE/EIS in the solar corona: spectroscopic signatures of Alfvenic waves and recurring upflows
- Global maps of the magnetic field in the solar corona
- Fine strand-like structure in the solar corona from MHD transverse oscillations
- First direct measurements of transverse waves in solar polar plumes using SDO/AIA
- The Spectroscopic Signature of Quasi-periodic Upflows in Active Region Timeseries
- A basal contribution from p-modes to the Alfvénic wave flux in the Sun's corona
- Resonant absorption in complicated plasma configurations: applications to multi-stranded coronal loop oscillations
- Heating by transverse waves in simulated coronal loops
- Spectroscopic signature of Alfvén waves damping in a polar coronal hole up to 0.4 solar radii
- Magnetohydrodynamic kink waves in nonuniform solar flux tubes: phase mixing and energy cascade to small scales
- Magnetohydrodynamic Fast Sausage Waves in the Solar Corona
- Modelling observed decay-less oscillations as resonantly enhanced Kelvin-Helmholtz vortices from transverse MHD waves and their seismological application
- Upflows in the upper solar atmosphere
- The passband integrationproperties of Birefringent filter
- First direct observation of a torsional Alfvén oscillation at coronal heights
- Decayless oscillations in solar coronal bright points
- The First 3D Coronal Loop Model Heated by MHD Waves against Radiative Losses
- Wave heating in gravitationally stratified coronal loops in the presence of resistivity and viscosity
- High Frequency Waves in Chromospheric Spicules
- Contribution of observed multi frequency spectrum of Alfvén waves to coronal heating
- Wave pressure and energy cascade rate of kink waves computed with Elsasser variables
- The Role of High-frequency Transverse Oscillations in Coronal Heating
- Resonant absorption in expanding coronal magnetic flux tubes with uniform density
- On the Parallel and Perpendicular Propagating Motions Visible in Polar Plumes: An Incubator For (Fast) Solar Wind Acceleration?
- Cut-off of transverse waves through the solar transition region
- Revisiting the relation between nonthermal line widths and transverse MHD wave amplitudes
- 30-min Decayless Kink Oscillations in a Very Long Bundle of Solar Coronal Plasma Loops
- A statistical study of propagating MHD kink waves in the quiescent corona
- Alfvénic motions arising from asymmetric acoustic wave drivers in solar magnetic structures
- Influence of the Lower Atmosphere on Wave Heating and Evaporation in Solar Coronal Loops
- Decayless oscillations in 3D coronal loops excited by a power-law driver
- Global Coronal Magnetic Field Estimation Using Bayesian Inference