Observational evidence for buffeting-induced kink waves in solar magnetic elements

Stangalini, M.; Consolini, Giuseppe; Berrilli, F.; Michelis, Paola De; Tozzi, Roberta

doi:10.1051/0004-6361/201424221

Cited by 30 publications

(30 citation statements)

References 67 publications

(93 reference statements)

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“…Indeed, these authors have shown that compressive and non-compressive waves, cannot only coexist in the same flux tube but that the kink mode can excite a longitudinal density perturbation, whose maximum is reached at the inversion points of the flux tube's horizontal motion. More recently, Stangalini et al (2014) observed the excitation of kink sub-harmonics in small magnetic elements in the solar photosphere. They also noted that sub-harmonics can be considered as the signature of the chaotic excitation of kink waves in strongly non-linear systems.…”

Section: Discussionmentioning

confidence: 99%

Withdrawn Article

2019

A&A

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Context. It is widely accepted that chromospheric fine structures are waveguides for several types of magnetohydrodynamic (MHD) oscillations, which can transport energy from the lower to upper layers of the Sun. Despite a number of recent advances in the field, a detailed study of the properties and physical nature of these oscillations remains a challenging task. Aims. Here we aim to study high-frequency transverse oscillations and intensity variations of spicular-type Hα features in an active region. Methods. We investigated high-resolution spectroscopic and imaging observations from the CRisp Imaging SpectroPolarimeter (CRISP) instrument on the Swedish 1-meter Solar Telescope (SST) to study the dynamics of chromospheric spicular structures. Time-distance analyses were used to examine the characteristics of the transverse (incompressible) and intensity (compressible) perturbations. The relationship between these incompressible and compressible oscillations were also investigated through direct comparisons of the fluctuations. Results. We detect transverse oscillations in chromospheric spicules at different positions along their length in both the vertical and horizontal directions with respect to the image plane. We also find a link between intensity perturbations and the horizontal velocity fluctuations of the flux tube. Conclusions. The observed oscillations are interpreted in terms of MHD helical kink waves. The link between intensity and horizontal velocity oscillations can be explained by the coupling of compressive with non-compressive waves and by the interaction of the flux tube with its neighbours. This leads to compressive perturbations correlated to the horizontal displacement of the tube itself.

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Section: Discussionmentioning

confidence: 99%

Withdrawn Article

2019

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“…This has important implications for the generation of a wide spectrum of viable propagating periodicities in the lower solar atmosphere, particularly if the driving (i.e., buffeting) frequencies are at values that are not necessarily multiples or fractions of the flux tube's natural frequency. Therefore, the work of Stangalini et al [2014] tentatively suggests that a broad spectrum of wave periodicities in small-scale magnetic elements can be generated regardless of the input motions.…”

Section: Kink Wavesmentioning

confidence: 99%

“…Most recently, Stangalini et al [2014] employed a long time series of high-resolution photospheric magnetograms to study the effects of turbulent convection on the excitation of kink oscillations in small-scale magnetic elements. Importantly, the authors utilised empirical mode decomposition techniques, which allowed them to more accurately analyse non-stationary time series which may be dominated by the horizontal displacements of magnetic flux tubes that are continuously advected and dispersed by granular flows.…”

Section: Kink Wavesmentioning

confidence: 99%

Ultra‐High‐Resolution Observations of MHD Waves in Photospheric Magnetic Structures

Jess

Verth

2016

Low‐Frequency Waves in Space Plasmas

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“…The EMD technique has already been employed to study kink waves in small-scale magnetic elements and more information about the application of this technique can be found in Stangalini et al (2014).…”

Section: Empirical Mode Decomposition (Emd)mentioning

confidence: 99%

Polarized Kink Waves in Magnetic Elements: Evidence for Chromospheric Helical Waves

Stangalini

Giannattasio

Erdélyi

et al. 2017

ApJ

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In recent years, new high spatial resolution observations of the Sunʼs atmosphere have revealed the presence of a plethora of small-scale magnetic elements down to the resolution limit of the current cohort of solar telescopes (∼100-120 km on the solar photosphere). These small magnetic field concentrations, due to the granular buffeting, can support and guide several magnetohydrodynamic wave modes that would eventually contribute to the energy budget of the upper layers of the atmosphere. In this work, exploiting the high spatial and temporal resolution chromospheric data acquired with the Swedish 1m Solar Telescope, and applying the empirical mode decomposition technique to the tracking of the solar magnetic features, we analyze the perturbations of the horizontal velocity vector of a set of chromospheric magnetic elements. We find observational evidence that suggests a phase relation between the two components of the velocity vector itself, resulting in its helical motion.

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Observational evidence for buffeting-induced kink waves in solar magnetic elements

Cited by 30 publications

References 67 publications

Withdrawn Article

Withdrawn Article

Ultra‐High‐Resolution Observations of MHD Waves in Photospheric Magnetic Structures

Polarized Kink Waves in Magnetic Elements: Evidence for Chromospheric Helical Waves

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