Contribution of observed multi frequency spectrum of Alfvén waves to coronal heating

Abstract

Whilst there are observational indications that transverse MHD waves carry enough energy to maintain the thermal structure of the solar corona, it is not clear whether such energy can be efficiently and effectively converted into heating. Phase-mixing of Alfvén waves is considered a candidate mechanism, as it can develop transverse gradient where magnetic energy can be converted into thermal energy. However, phase-mixing is a process that crucially depends on the amplitude and period of the transverse oscillations, and only recently have we obtained a complete measurement of the power spectrum for transverse oscillations in the corona. We aim to investigate the heating generated by phase-mixing of transverse oscillations triggered by buffeting of a coronal loop that follows from the observed coronal power spectrum as well as the impact of these persistent oscillations on the structure of coronal loops. We consider a 3D MHD model of an active region coronal loop and we perturb its footpoints with a 2D horizontal driver that represents a random buffeting motion of the loop footpoints. Our driver is composed of 1000 pulses superimposed to generate the observed power spectrum. We find that the heating supply from the observed power spectrum in the solar corona through phase mixing is not sufficient to maintain the million degree active region solar corona. We also find that the development of Kelvin-Helmholtz instabilities could be a common phenomenon in coronal loops that could affect their apparent life time. This study concludes that is unlikely that phase-mixing of Alfvén waves resulting from an observed power spectrum of transverse coronal loop oscillations can heat the active region solar corona. However, transverse waves could play an important role in the development of small scale structures.

References in corpus (28)

• Alfven Waves in the Lower Solar Atmosphere
• Heating of the Solar Chromosphere and Corona by Alfven Wave Turbulence
• MPI-AMRVAC for Solar and Astrophysics
• Key Aspects of Coronal Heating
• A Contemporary View of Coronal Heating
• Nonlinear Instability of kink oscillations due to shear motions
• Resonant Absorption of Transverse Oscillations and Associated Heating in a Solar Prominence. II- Numerical aspects
• Recent advances in coronal heating
• Numerical simulations of conversion to Alfven waves in sunspots
• Three Dimensional MHD Wave Propagation and Conversion to Alfven Waves near the Solar Surface. I. Direct Numerical Solution
• A statistical study of decaying kink oscillations detected using SDO/AIA
• A global view of velocity fluctuations in the corona below 1.3 $R_{\odot }$ with CoMP
• Heating by transverse waves in simulated coronal loops
• Damping of nonlinear standing kink oscillations: a numerical study
• Generalized phase mixing: Turbulence-like behaviour from unidirectionally propagating MHD waves
• The generation and damping of propagating MHD kink waves in the solar atmosphere
• Hi-C & AIA observations of transverse MHD waves in active regions
• First comparison of wave observations from CoMP and AIA/SDO
• The effects of resistivity and viscosity on the Kelvin-Helmholtz instability in oscillating coronal loops
• 3D MHD modeling of twisted coronal loops
• Contribution of mode coupling and phase-mixing of Alfvén waves to coronal heating
• An overview of flux braiding experiments
• An Automated Algorithm for Identifying and Tracking Transverse Waves in Solar Images
• Fast-to-Alfvén Mode Conversion Mediated by Hall Current. I. Cold Plasma Model
• Contribution of phase-mixing of Alfvén waves to coronal heating in multi-harmonic loop oscillations
• In-situ generation of transverse MHD waves from colliding flows in the solar corona
• Superoscillations in solar MHD waves and their possible role in heating coronal loops
• On the nature of transverse coronal waves revealed by wavefront dislocations

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• Coronal heating by MHD waves
• Amplitudes and energy fluxes of simulated decayless kink oscillations
• The First 3D Coronal Loop Model Heated by MHD Waves against Radiative Losses
• Non-linear damping of standing kink waves computed with Elsasser variables
• A solar coronal loop in a box: Energy generation and heating
• Corona and XUV emission modelling of the Sun and Sun-like stars
• Wave modes excited by photospheric p-modes and mode conversion in a multi-loop system
• Damping of Propagating Kink Waves in the Solar Corona
• Weak damping of propagating MHD kink waves in the quiescent corona
• Coronal loop transverse oscillations excited by different driver frequencies
• Wave heating in simulated multi-stranded coronal loops
• Effect of Coronal Loop Structure on Wave Heating by Phase Mixing
• Excitation and evolution of coronal oscillations in self-consistent 3D radiative MHD simulations of the solar atmosphere
• Decayless oscillations in 3D coronal loops excited by a power-law driver
• Propagating Kink Waves in an Open Coronal Magnetic Flux Tube with Gravitational Stratification: Magnetohydrodynamic Simulation and Forward Modelling
• Forward Modelling of MHD Waves in Braided Magnetic Fields
• Coronal kink oscillations and photospheric driving: combining SolO/EUI and SST/CRISP high-resolution observations
• Kelvin-Helmholtz instability and heating in oscillating loops perturbed by power-law transverse wave drivers
• High-Frequency Magnetohydrodynamic Waves with Substantial Energy in the Solar Polar Corona