Catalog of Decaying Kink Oscillations of Coronal Loops in the 24th Solar Cycle

Nechaeva, Alena; Zimovets, I. V.; Nakariakov, V. M.; Goddard, Christopher R.

doi:10.3847/1538-4365/ab0e86

Cited by 94 publications

(121 citation statements)

References 28 publications

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“…These waves are considered to be global magnetohydrodynamic (MHD) kink eigenmodes, most commonly detected as the fundamental mode, with an antinode in the vicinity of the loop apex. The relation between the period of oscillation and the estimated loop length in Goddard et al (2016) and Nechaeva et al (2019) confirmed this interpretation.…”

Section: Introductionsupporting

confidence: 68%

“…Su et al (2018) reported density variations of the oscillating loop and related them to the period variation of the kink mode. Loop oscillation studies typically observe loops for about an hour, and a visible evolution of the intensity and structure is frequently observed (see example time-distance (TD) maps in Goddard et al 2016;Nechaeva et al 2019), and it is becoming increasingly important to analyse this evolution in greater detail.…”

Section: Introductionmentioning

confidence: 99%

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Temporal evolution of oscillating coronal loops

Goddard

Nisticò

2020

A&A

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Context. Transverse oscillations of coronal structures are currently intensively studied to explore the associated magnetohydrodynamic wave physics and perform seismology of the local medium. Aims. We make a first attempt to measure the thermodynamic evolution of a sample of coronal loops that undergo decaying kink oscillations in response to an eruption in the corresponding active region. Methods. Using data from the six coronal wavelengths of SDO/AIA, we performed a differential emission measure (DEM) analysis of 15 coronal loops before, during, and after the eruption and oscillation. Results. We find that the emission measure, temperature, and width of the DEM distribution undergo significant variations on timescales relevant for the study of transverse oscillations. There are no clear collective trends of increases or decreases for the parameters we analysed. The strongest variations of the parameters occur during the initial perturbation of the loops, and the influence of background structures may also account for much of this variation. Conclusions. The DEM analysis of oscillating coronal loops in erupting active regions shows evidence of evolution on timescales important for the study of oscillations. Further work is needed to separate the various observational and physical mechanisms that may be responsible for the variations in temperature, DEM distribution width, and total emission measure.

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Section: Introductionsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Temporal evolution of oscillating coronal loops

Goddard

Nisticò

2020

A&A

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“…They were first observed using the Transition Region And Coronal Explorer (TRACE; Handy et al, 1999) in an active region perturbed by a solar flare (Aschwanden et al, 1999;Nakariakov et al, 1999). Hundreds of observations of standing kink modes have now been studied (e.g., catalogs by Goddard et al, 2016;Nechaeva et al, 2019), aided by the full disk coverage and enhanced temporal resolution of the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO; Lemen et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Oscillation and Evolution of Coronal Loops in a Dynamical Solar Corona

Pascoe

Goddard

Doorsselaere

2020

Front. Astron. Space Sci.

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“…Consequently the loop sways about its (new) equilibrium position with decaying amplitude for about one hour, after which the loop disappears out of the 171 Å passband. This event constitutes a standing kink oscillation, referenced in the kink oscillation catalogue compiled in Nechaeva et al (2019) as Event 27 Loop 1.…”

Section: Observationmentioning

confidence: 99%

“…Standing kink oscillations in coronal loops have been extensively observed with a typical period, P kink , of several minutes (c.f. statistical studies by Goddard et al 2016;Nechaeva et al 2019); both period and damping time have been observed to scale linearly with the loop length L. Through these observations the seismological estimation of the (local) magnetic field can be made, which is often difficult to determine directly (Nakariakov & Ofman 2001). However this magnetic field value relies on esti-mates of the density and a spatial average of Alfvén speed along the entire loop.…”

Section: Introductionmentioning

confidence: 99%

Observational signatures of the third harmonic in a decaying kink oscillation of a coronal loop

Duckenfield

Goddard

Pascoe

et al. 2019

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Aims. An observation of a coronal loop standing kink mode is analysed to search for higher harmonics, aiming to reveal the relation between different harmonics’ quality factors. Methods. Observations of a coronal loop were taken by the Atmospheric Imaging Assembly (AIA) of the Solar Dynamics Observatory (SDO). The loop’s axis was tracked at many spatial positions along the loop to generate time series data. Results. The distribution of spectral power of the oscillatory transverse displacements throughout the loop reveals the presence of two harmonics, a fundamental at a period of ∼8 min and its third harmonic at ∼2.6 min. The node of the third harmonic is seen at approximately a third of the way along the length of the loop, and cross correlations between the oscillatory motion on opposing sides of the node show a change in phase behaviour. The ratio of periods P1/3P3 was found to be ∼0.87, indicating a non-uniform distribution of kink speed through the loop. The quality factor for the fundamental mode of oscillation was measured to be ∼3.4. The quality factor of the third harmonic was measured for each spatial location and, where data was reliable, yielded a value of ∼3.6. For all locations, the quality factors for the two harmonics were found to agree within error as expected from 1d resonant absorption theory. This is the first time a measurement of the signal quality for a higher harmonic of a kink oscillation has been reported with spatially resolved data.

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Catalog of Decaying Kink Oscillations of Coronal Loops in the 24th Solar Cycle

Cited by 94 publications

References 28 publications

Temporal evolution of oscillating coronal loops

Temporal evolution of oscillating coronal loops

Oscillation and Evolution of Coronal Loops in a Dynamical Solar Corona

Observational signatures of the third harmonic in a decaying kink oscillation of a coronal loop

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