Magnetic shocks and substructures excited by torsional Alfvén wave interactions in merging expanding flux tubes
arXiv:1803.06112 · doi:10.3847/1538-4357/aab7f7
Abstract
Vortex motions are frequently observed on the solar photosphere. These motions may play a key role in the transport of energy and momentum from the lower atmosphere into the upper solar atmosphere, contributing to coronal heating. The lower solar atmosphere also consists of complex networks of flux tubes that expand and merge throughout the chromosphere and upper atmosphere. We perform numerical simulations to investigate the behaviour of vortex driven waves propagating in a pair of such flux tubes in a non-force-free equilibrium with a realistically modelled solar atmosphere. The two flux tubes are independently perturbed at their footpoints by counter-rotating vortex motions. When the flux tubes merge, the vortex motions interact both linearly and nonlinearly. The linear interactions generate many small-scale transient magnetic substructures due to the magnetic stress imposed by the vortex motions. Thus, an initially monolithic tube is separated into a complex multi-threaded tube due to the photospheric vortex motions. The wave interactions also drive a superposition that increases in amplitude until it exceeds the local Mach number and produces shocks that propagate upwards with speeds of approximately km s. The shocks act as conduits transporting momentum and energy upwards, and heating the local plasma by more than an order of magnitude, with peak temperature approximately K. Therefore, we present a new mechanism for the generation of magnetic waveguides from the lower solar atmosphere to the solar corona. This wave guide appears as the result of interacting perturbations in neighbouring flux tubes. Thus, the interactions of photospheric vortex motions is a potentially significant mechanism for energy transfer from the lower to upper solar atmosphere.
References in corpus (34)
- A Tale Of Two Spicules: The Impact of Spicules on the Magnetic Chromosphere
- Alfven Waves in the Lower Solar Atmosphere
- Multiwavelength studies of MHD waves in the solar chromosphere: An overview of recent results
- Observations of ubiquitous compressive waves in the Sun's chromosphere
- On-disk counterparts of type II spicules in the Ca II 854.2 nm and Halpha lines
- Oscillations and waves in solar spicules
- Solar fine-scale structures. I. Spicules and other small-scale, jet-like events at the chromospheric level: observations and physical parameters
- Alfven Waves in the Solar Atmosphere
- Standing Slow-Mode Waves in Hot Coronal Loops: Observations, Modeling, and Coronal Seismology
- An Interface Region Imaging Spectrograph first view on Solar Spicules
- Interplay of three kinds of motion in the disk counterpart of type II spicules: up-flow, transversal and torsional motions
- Alfvén waves in simulations of solar photospheric vortices
- Dynamics of the Solar Magnetic Network. II. Heating the Magnetized Chromosphere
- Dynamics of the Solar Magnetic Network: Two-dimensional MHD Simulations
- Revision of Solar Spicule Classification
- Spicule-like structures observed in 3D realistic MHD simulations
- 3D Simulations of Magnetohydrodynamic Waves in the Magnetized Solar Atmosphere
- Numerical simulations of spicule formation in the solar atmosphere
- The generation and damping of propagating MHD kink waves in the solar atmosphere
- Characteristics of transverse waves in chromospheric mottles
- Generation of Magnetohydrodynamic Waves in Low Solar Atmospheric Flux Tubes by Photospheric Motions
- Vortex Flows in the Solar Chromosphere -- I. Automatic detection method
- Jet formation in solar atmosphere due to magnetic reconnection
- Transverse oscillations of a multi-stranded loop
- Driving Solar Spicules and Jets with Magnetohydrodynamic Turbulence: Testing a Persistent Idea
- On the multi-threaded nature of solar spicules
- First simultaneous SST/CRISP and IRIS observations of a small-scale quiet Sun vortex
- Magnetohydrostatic equilibrium. I: Three-dimensional open magnetic flux tube in the stratified solar atmosphere
- Resonant Absorption of Axisymmetric Modes in Twisted Magnetic Flux Tubes
- Magnetic swirls and associated fast magnetoacoustic kink waves in a solar chromospheric flux tube
- Excitation of standing kink oscillations in coronal loops
- Photospheric Logarithmic Velocity Spirals as MHD Wave Generation Mechanisms
- Temporal variations of X-ray solar flare loops: length, corpulence, position, temperature, plasma pressure and spectra
- Magnetohydrostatic equilibrium. II. Three-dimensional multiple open magnetic flux tubes in the stratified solar atmosphere
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- Magnetohydrodynamic Non-linearities in Sunspot Atmospheres: Chromospheric Detections of Intermediate Shocks
- Stirring the Base of the Solar Wind: On Heat Transfer and Vortex Formation
- The Propagation of Coherent Waves Across Multiple Solar Magnetic Pores
- Small-scale solar jet formation and their associated waves and instabilities
- Torsional Alfvénic Oscillations Discovered in the Magnetic Free Energy During Solar Flares
- Influence of ambipolar and Hall effects on vorticity in 3D simulations of magneto-convection
- The effect of linear background rotational flows on magnetoacoustic modes of a photospheric magnetic flux tube
- Varying Driver Velocity Fields in Photospheric MHD Wave Simulations
- Modelling 3D magnetic networks in a realistic solar atmosphere