Kelvin-Helmholtz instability in solar chromospheric jets: theory and observation

Abstract

Using data obtained by the high resolution CRisp Imaging SpectroPolarimeter instrument on the Swedish 1-m Solar Telescope, we investigate the dynamics and stability of quiet-Sun chromospheric jets observed at disk center. Small-scale features, such as Rapid Redshifted and Blueshifted Excursions, appearing as high speed jets in the wings of the H$\alpha$ line, are characterized by short lifetimes and rapid fading without any descending behavior. To study the theoretical aspects of their stability without considering their formation mechanism, we model chromospheric jets as twisted magnetic flux tubes moving along their axis, and use the ideal linear incompressible magnetohydrodynamic approximation to derive the governing dispersion equation. Analytical solutions of the dispersion equation indicate that this type of jet is unstable to Kelvin-Helmholtz instability (KHI), with a very short (few seconds) instability growth time at high upflow speeds. The generated vortices and unresolved turbulent flows associated with the KHI could be observed as broadening of chromospheric spectral lines. Analysis of the H$\alpha$ line profiles shows that the detected structures have enhanced line widths with respect to the background. We also investigate the stability of a larger scale H$\alpha$ jet that was ejected along the line-of-sight. Vortex-like features, rapidly developing around the jet's boundary, are considered as evidence of the KHI. The analysis of the energy equation in the partially ionized plasma shows that the ion-neutral collisions may lead to the fast heating of the KH vortices over timescales comparable to the lifetime of chromospheric jets.

arXiv comment10 pages, 8 figures, accepted in ApJ

References in corpus (42)

• CRISP Spectropolarimetric Imaging of Penumbral Fine Structure
• A Tale Of Two Spicules: The Impact of Spicules on the Magnetic Chromosphere
• Prevalence of Small-scale Jets from the Networks of the Solar Transition Region and Chromosphere
• CRISPRED: A data pipeline for the CRISP imaging spectropolarimeter
• Ubiquitous torsional motions in type II spicules
• Heating of the magnetized solar chromosphere by partial ionization effects
• On-disk counterparts of type II spicules in the Ca II 854.2 nm and Halpha lines
• Solar fine-scale structures. I. Spicules and other small-scale, jet-like events at the chromospheric level: observations and physical parameters
• Nonlinear Instability of kink oscillations due to shear motions
• Magnetohydrodynamic waves in solar partially ionized plasmas: two-fluid approach
• An Interface Region Imaging Spectrograph first view on Solar Spicules
• On the prevalence of small-scale twist in the solar chromosphere and transition region
• Fine strand-like structure in the solar corona from MHD transverse oscillations
• Resonant Absorption of Transverse Oscillations and Associated Heating in a Solar Prominence. II- Numerical aspects
• Flocculent flows in the chromospheric canopy of a sunspot
• Search for high velocities in the disk counterpart of type II spicules
• SDO/AIA Observation of Kelvin-Helmholtz Instability in the Solar Corona
• The solar chromosphere at high resolution with IBIS. IV. Dual-line evidence of heating in chromospheric network
• Halpha line profile asymmetries and the chromospheric flare velocity field
• Interplay of three kinds of motion in the disk counterpart of type II spicules: up-flow, transversal and torsional motions
• 3D Temperature Mapping of Solar Photospheric Fine Structure Using Ca II H Filtergrams
• Heating signatures in the disk counterparts of solar spicules in IRIS observations
• Revision of Solar Spicule Classification
• Stability of rotating magnetized jets in the solar atmosphere. I. Kelvin-Helmholtz instability
• Dynamics of coronal rain and descending plasma blobs in solar prominences: II. partially ionized case
• The Dynamics of Rapid Redshifted and Blueshifted Excursions in the Solar Halpha line
• Kelvin-Helmholtz instability in coronal magnetic flux tubes due to azimuthal shear flows
• The Kelvin-Helmholtz Instability at CME-Boundaries in the Solar Corona: Observations and 2.5D MHD Simulations
• Numerical simulations of spicule formation in the solar atmosphere
• On the Temporal Evolution of the Disc Counterpart of Type II Spicules in Quiet Sun
• Damping of Alfven waves in solar partially ionized plasmas: effect of neutral helium in multi-fluid approach
• Kelvin-Helmholtz instability in partially ionized compressible plasmas
• Overdamped Alfven waves due to ion-neutral collisions in the solar chromosphere
• Thermal fine structure and magnetic fields in the solar atmosphere: spicules and fibrils
• Can coronal hole spicules reach coronal temperatures?
• Quiet Sun Hα Transients and Corresponding Small-Scale Transition Region and Coronal Heating
• Kelvin-Helmholtz instability of twisted magnetic flux tubes in the solar wind
• Kelvin-Helmholtz instability of a coronal streamer
• The solar chromosphere observed at 1 Hz and 0."2 resolution
• Onset of the Kelvin-Helmholtz instability in partially ionized magnetic flux tubes
• Kelvin-Helmholtz instability of kink waves in photospheric twisted flux tubes
• Off-limb (spicule) DEM distribution from SoHO/SUMER observations

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• Flow instabilities in solar jets in their upstream and downstream regimes
• Solar Jet on 2014 April 16 Modeled by Kelvin--Helmholtz Instability
• Numerical simulations of macrospicule jets under energy imbalance conditions in the solar atmosphere
• Kink instability of triangular jets in the solar atmosphere
• Kelvin-Helmholtz instability and Alfvenic vortex shedding in solar eruptions
• On the Response of the Transition Region and the Corona to Rapid Excursions in the Chromosphere
• Dynamic kink instability and transverse motions of solar spicules
• Spicules in IRIS Mg II Observations: Automated Identification
• A persistent quiet-Sun small-scale tornado. II. Oscillations
• How Rotating Solar Atmospheric Jets Become Kelvin--Helmholtz Unstable
• Two-Dimensional Kelvin-Helmholtz Instability with Anisotropic Pressure