Spectral Observations of the Eruption of a Filament

Mashnich, G. P.; Kiselev, Aleksandr

doi:10.1134/s1063772919070060

Cited by 2 publications

(1 citation statement)

References 33 publications

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“…Since such a decayless oscillation was followed by eruption, they tentatively proposed that long-duration oscillations could be a precursor of prominence eruptions and coronal mass ejections (CMEs). Since then, an increasing number of observations have indicated that decayless oscillations of prominences/filaments are followed by eruptions (Gosain et al 2009;Duchlev et al 2010;Li & Zhang 2012;Mashnich & Bashkirtsev 2016;Mashnich & Kiselev 2019). More recently, Luna et al (2018) conducted a survey of 196 filament longitudinal oscil-lation events in the first half of 2014 and found that while the distribution of the ratio between the decay time and the period peaks at 1.25 and most events damp out in 3 periods, a few events manifest long-term oscillations without significant damping or even with amplification.…”

Section: Introductionmentioning

confidence: 99%

Decayless longitudinal oscillations of a solar filament maintained by quasi-periodic jets

Ni,

Guo,

Zhang

et al. 2022

Preprint

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Context. As a ubiquitous phenomenon, large-amplitude longitudinal filament oscillations usually decay in 1-4 periods. Recently, we observed a decayless case of such oscillations in the corona. Aims. We try to understand the physical process that maintains the decayless oscillation of the filament. Methods. Multi-wavelength imaging observations and magnetograms are collected to study the dynamics of the filament oscillation and its associated phenomena. To explain the decayless oscillations, we also perform one-dimensional hydrodynamic numerical simulations using the MPI-AMRVAC code. Results. In observations, the filament oscillates decaylessly with a period of 36.4 ± 0.3 min for almost 4 hours before eruption. During oscillations, four quasi-periodic jets emanate from a magnetic cancellation site near the filament. The time interval between neighboring jets is ∼ 68.9 ± 1.0 min. Numerical simulations constrained by the observations reproduced the decayless longitudinal oscillations. However, it is surprising to find that the period of the decayless oscillations is not consistent with the pendulum model. Conclusions. We propose that the decayless longitudinal oscillations of the filament are maintained by quasi-periodic jets, which is verified by the hydrodynamic simulations. More importantly, it is found that, when driven by quasi-periodic jets, the period of the filament longitudinal oscillations depends also on the driving period of the jets, not simply the pendulum period. With a parameter survey in simulations, we derived a formula, by which one can derive the pendulum oscillation period using the observed period of decayless filament oscillations and the driving periods of jets.

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Section: Introductionmentioning

confidence: 99%

Decayless longitudinal oscillations of a solar filament maintained by quasi-periodic jets

Ni,

Guo,

Zhang

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

Decayless longitudinal oscillations of a solar filament maintained by quasi-periodic jets

Guo

Zhang

et al. 2022

A&A

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Context. As a ubiquitous phenomenon, large-amplitude longitudinal filament oscillations usually decay in 1–4 periods. Recently, we observed a decayless case of such oscillations in the corona. Aims. We try to understand the physical process that maintains the decayless oscillation of the filament. Methods. Multiwavelength imaging observations and magnetograms were collected to study the dynamics of the filament oscillation and its associated phenomena. To explain the decayless oscillations, we also performed one-dimensional hydrodynamic numerical simulations using the code MPI-AMRVAC. Results. In observations, the filament oscillates without decay with a period of 36.4 ± 0.3 min for almost 4 h before eruption. During oscillations, four quasi-periodic jets emanate from a magnetic cancellation site near the filament. The time interval between neighboring jets is ∼68.9 ± 1.0 min. Numerical simulations constrained by the observations reproduced the decayless longitudinal oscillations. However, it is surprising to find that the period of the decayless oscillations is not consistent with the pendulum model. Conclusions. We propose that the decayless longitudinal oscillations of the filament are maintained by quasi-periodic jets, which is verified by the hydrodynamic simulations. More importantly, it is found that, when it is driven by quasi-periodic jets, the period of the filament longitudinal oscillations also depends on the driving period of the jets, not on the pendulum period alone. With a parameter survey in simulations, we derived a formula by which the pendulum oscillation period can be derived using the observed period of decayless filament oscillations and the driving periods of jets.

show abstract

Spectral Observations of the Eruption of a Filament

Cited by 2 publications

References 33 publications

Decayless longitudinal oscillations of a solar filament maintained by quasi-periodic jets

Decayless longitudinal oscillations of a solar filament maintained by quasi-periodic jets

Decayless longitudinal oscillations of a solar filament maintained by quasi-periodic jets

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