Kink Waves in Non-isothermal Stratified Solar Waveguides: Effect of the External Magnetic Field

Lopin, I.; Nagorny, I. G.

doi:10.3847/1538-3881/aa859e

Cited by 7 publications

(15 citation statements)

References 47 publications

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“…Verth & Erdélyi 2008;Pascoe & Nakariakov 2016), temperature difference effects (e.g. Guo et al 2015;Lopin & Nagorny 2017), siphon flows (e.g. Yu et al 2016) and ellipticity of the loop (Dymova & Ruderman 2006).…”

Section: Discussionmentioning

confidence: 99%

Detection of the Second Harmonic of Decay-less Kink Oscillations in the Solar Corona

Duckenfield

Anfinogentov

Pascoe

et al. 2018

ApJL

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EUV observations of a multi-thermal coronal loop, taken by the Atmospheric Imaging Assembly (AIA) of the Solar Dynamics Observatory (SDO), which exhibits decay-less kink oscillations are presented. The datacube of the quiet Sun coronal loop was passed through a motion magnification algorithm to accentuate transverse oscillations. Timedistance maps are made from multiple slits evenly spaced along the loop axis and oriented orthogonal to the loop axis. Displacements of the intensity peak are tracked to generate time series of the loop displacement. Fourier analysis on the time series show the presence of two periods within the loop; P 1 = 10.3 +1.5 −1.7 minutes and P 2 = 7.4 +1.1 −1.3 minutes. The longer period component is greatest in amplitude at the apex and remains in phase throughout the loop length. The shorter period component is strongest further down from the apex on both legs, and displays an anti-phase behaviour between the two loop legs. We interpret these results as the coexistence of the fundamental and second harmonics of the standing kink mode within the loop in the decay-less oscillation regime. An illustration of seismological application using the ratio P 1 /2P 2 ∼ 0.7 to estimate the density scale height is presented. The existence of multiple harmonics has implications for understanding the driving and damping mechanisms for decay-less oscillations, and adds credence to their interpretation as standing kink mode oscillations.

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Section: Discussionmentioning

confidence: 99%

Detection of the Second Harmonic of Decay-less Kink Oscillations in the Solar Corona

Duckenfield

Anfinogentov

Pascoe

et al. 2018

ApJL

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“…On the contrary, the Snow et al (2017) model correctly predicts the cut-off frequency only in the lower transition region, but fails to do so in the upper transition region and corona. In particular, their model predicts a slower decrease of the cut-off frequency above 20 Mm, while the simulations and the Lopin & Nagorny (2017) show a continued decrease. Finally, the Spruit (1981) predictions are off by almost an order of magnitude at all altitudes.…”

Section: Discussion: Comparison To Analytical Formulasmentioning

confidence: 95%

“…Finally, the Spruit (1981) predictions are off by almost an order of magnitude at all altitudes. Thus, the formula of Lopin & Nagorny (2017) best predicts the cut-off frequency of transverse waves at different altitudes.…”

Section: Discussion: Comparison To Analytical Formulasmentioning

confidence: 95%

“…The final temperature and density profile significantly differ from the initial conditions of 2D relaxation run. However, this is not an issue, as the goal of this study is to investigate how the analytical formulas we consider (Spruit 1981;Lopin & Nagorny 2017;Snow et al 2017) predict the cut-off frequency for a given temperature and density profile. By using the relaxed profiles as an input to these analytical formulas, we obtained predictions for the relaxed system.…”

Section: Flux Tube Relaxation (2d)mentioning

confidence: 99%

“…However, Lopin et al (2014) showed that this classical cut-off is suppressed when the radial component of the magnetic field is taken into account. Lopin & Nagorny (2017) later showed that transverse waves can still be cut-off, provided a non-isothermal atmosphere. They predict the following cut-off frequency:…”

Section: Introductionmentioning

confidence: 99%

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Cut-off of transverse waves through the solar transition region

Pelouze¹,

Doorsselaere²,

Karampelas³

et al. 2023

Preprint

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Context. Transverse oscillations are ubiquitously observed in the solar corona, both in coronal loops and open magnetic flux tubes. Numerical simulations suggest that their dissipation could heat coronal loops, counterbalancing radiative losses. These models rely on a continuous driver at the footpoint of the loops. However, analytical works predict that transverse waves are subject to a cut-off in the transition region. It is thus unclear whether they can reach the corona, and indeed heat coronal loops. Aims. Our aims are to determine how the cut-off of kink waves affects their propagation into the corona, and to characterize the variation of the cut-off frequency with altitude. Methods. Using 3D magnetohydrodynamic simulations, we modelled the propagation of kink waves in a magnetic flux tube, embedded in a realistic atmosphere with thermal conduction, that starts in the chromosphere and extends into the corona. We drove kink waves at four different frequencies, and determined whether they experienced a cut-off. We then calculated the altitude at which the waves were cut-off, and compared it to the prediction of several analytical models. Results. We show that kink waves indeed experience a cut-off in the transition region, and we identified the analytical model that gives the best predictions. In addition, we show that waves with periods shorter than approximately 500 s can still reach the corona by tunnelling through the transition region, with little to no attenuation of their amplitude. This means that such waves can still propagate from the footpoints of loop, and result in heating in the corona.

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Cutoff of transverse waves through the solar transition region

Pelouze

Doorsselaere

Karampelas

et al. 2023

A&A

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Context. Transverse oscillations are ubiquitously observed in the solar corona, both in coronal loops and in open magnetic flux tubes. Numerical simulations suggest that their dissipation could heat coronal loops, thus counterbalancing radiative losses. These models rely on a continuous driver at the footpoint of the loops. However, analytical works predict that transverse waves are subject to a cutoff in the transition region. It is thus unclear whether they can reach the corona and indeed heat coronal loops. Aims. Our aims are to determine how the cutoff of kink waves affects their propagation into the corona and to characterize the variation of the cutoff frequency with altitude. Methods. Using 3D magnetohydrodynamic simulations, we modelled the propagation of kink waves in a magnetic flux tube, embedded in a realistic atmosphere with thermal conduction, which starts in the chromosphere and extends into the corona. We drove kink waves at four different frequencies and determined whether they experienced a cutoff. We then calculated the altitude at which the waves were cut off and compared it to the prediction of several analytical models. Results. We show that kink waves indeed experience a cutoff in the transition region, and we identified the analytical model that gives the best predictions. In addition, we show that waves with periods shorter than approximately 500 s can still reach the corona by tunnelling through the transition region with little to no attenuation of their amplitude. This means that such waves can still propagate from the footpoints of loop and result in heating in the corona.

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Kink Waves in Non-isothermal Stratified Solar Waveguides: Effect of the External Magnetic Field

Cited by 7 publications

References 47 publications

Detection of the Second Harmonic of Decay-less Kink Oscillations in the Solar Corona

Detection of the Second Harmonic of Decay-less Kink Oscillations in the Solar Corona

Cut-off of transverse waves through the solar transition region

Cutoff of transverse waves through the solar transition region

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