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Title: Solar Filament Longitudinal Oscillations along a Magnetic Field Tube with Two Dips

Abstract

Large-amplitude longitudinal oscillations of solar filaments have been observed and explored for more than ten years. Previous studies are mainly based on the one-dimensional rigid flux tube model with a single magnetic dip. However, it has been noted that there might be two magnetic dips, and hence two threads, along one magnetic field line. Following previous work, we intend to investigate the kinematics of the filament longitudinal oscillations when two threads are magnetically connected, which is done by solving one-dimensional radiative hydrodynamic equations with the numerical code MPI-AMRVAC. Two different types of perturbations are considered, and the difference from previous works resulting from the interaction of the two filament threads is investigated. We find that even with the inclusion of the thread–thread interaction, the oscillation period is modified weakly, by at most 20% compared to the traditional pendulum model with one thread. However, the damping timescale is significantly affected by the thread–thread interaction. Hence, we should take it into account when applying the consistent seismology to the filaments where two threads are magnetically connected.

Authors:
; ; ; ;  [1]
  1. School of Astronomy and Space Science, Nanjing University, Nanjing 210023 (China)
Publication Date:
OSTI Identifier:
22661171
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 839; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; COHERENT TUBE MODEL; COMPARATIVE EVALUATIONS; DAMPING; DISTURBANCES; EQUATIONS; FILAMENTS; HYDRODYNAMICS; INTERACTIONS; MAGNETIC FIELDS; MECHANICAL VIBRATIONS; ONE-DIMENSIONAL CALCULATIONS; OSCILLATIONS; PERTURBATION THEORY; SEISMOLOGY; SUN; TIME MEASUREMENT

Citation Formats

Zhou Yu-Hao, Zhang Li-Yue, Ouyang, Y., Chen, P. F., and Fang, C., E-mail: chenpf@nju.edu.cn. Solar Filament Longitudinal Oscillations along a Magnetic Field Tube with Two Dips. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA67DE.
Zhou Yu-Hao, Zhang Li-Yue, Ouyang, Y., Chen, P. F., & Fang, C., E-mail: chenpf@nju.edu.cn. Solar Filament Longitudinal Oscillations along a Magnetic Field Tube with Two Dips. United States. doi:10.3847/1538-4357/AA67DE.
Zhou Yu-Hao, Zhang Li-Yue, Ouyang, Y., Chen, P. F., and Fang, C., E-mail: chenpf@nju.edu.cn. Mon . "Solar Filament Longitudinal Oscillations along a Magnetic Field Tube with Two Dips". United States. doi:10.3847/1538-4357/AA67DE.
@article{osti_22661171,
title = {Solar Filament Longitudinal Oscillations along a Magnetic Field Tube with Two Dips},
author = {Zhou Yu-Hao and Zhang Li-Yue and Ouyang, Y. and Chen, P. F. and Fang, C., E-mail: chenpf@nju.edu.cn},
abstractNote = {Large-amplitude longitudinal oscillations of solar filaments have been observed and explored for more than ten years. Previous studies are mainly based on the one-dimensional rigid flux tube model with a single magnetic dip. However, it has been noted that there might be two magnetic dips, and hence two threads, along one magnetic field line. Following previous work, we intend to investigate the kinematics of the filament longitudinal oscillations when two threads are magnetically connected, which is done by solving one-dimensional radiative hydrodynamic equations with the numerical code MPI-AMRVAC. Two different types of perturbations are considered, and the difference from previous works resulting from the interaction of the two filament threads is investigated. We find that even with the inclusion of the thread–thread interaction, the oscillation period is modified weakly, by at most 20% compared to the traditional pendulum model with one thread. However, the damping timescale is significantly affected by the thread–thread interaction. Hence, we should take it into account when applying the consistent seismology to the filaments where two threads are magnetically connected.},
doi = {10.3847/1538-4357/AA67DE},
journal = {Astrophysical Journal},
number = 1,
volume = 839,
place = {United States},
year = {Mon Apr 10 00:00:00 EDT 2017},
month = {Mon Apr 10 00:00:00 EDT 2017}
}