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Three-dimensional oscillations of twenty one halo coronal mass ejections by multi-spacecraft
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Lee, Harim, Moon, Y.-J., Nakariakov, V. M. (Valery M.), Na, Hyeonock, Cho, Il-Hyun and Park, Eunsu (2018) Three-dimensional oscillations of twenty one halo coronal mass ejections by multi-spacecraft. The Astrophysical Journal, 868 (1). 18. doi:10.3847/1538-4357/aae5f6
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Official URL: https://doi.org/10.3847/1538-4357/aae5f6
Abstract
We investigate the 3D structure of kinematic oscillations of full halo coronal mass ejections (FHCMEs) using multi-spacecraft coronagraph data from two non-parallel lines of sight. For this, we consider 21 FHCMEs which are simultaneously observed by the Solar and Heliospheric Observatory and the Solar TErrestrial RElations Observatory A or B, from 2010 June to 2012 August when the spacecraft were roughly in quadrature. Using sequences of running difference images, we estimate the instantaneous projected speeds of the FHCMEs at 24 different azimuthal angles in the planes of the sky of those coronagraphs. We find that all these FHCMEs have experienced kinematic oscillations characterized by quasi-periodic variations of the instantaneous projected radial velocity with periods ranging from 24 to 48 min. The oscillations detected in the analyzed events are found to show distinct azimuthal wave modes. Thirteen events (about 62%) are found to oscillate with the azimuthal wave number m = 1. The oscillating directions of the nodes of the m = 1 mode for these FHCMEs are consistent with those of their position angles (or the direction of eruption), with a mean difference of about 23°. The oscillation amplitude is found to correlate well with the projected radial speed of the CME. An estimation of Lorentz accelerations shows that they are dominant over other forces, implying that the magnetic force is responsible for the kinematic oscillations of CMEs. However, we cannot rule out other possibilities: a global layer of enhanced current around the CMEs or the nonlinear nature of its driver, for example the effect of vortex shedding.
| Item Type: | Journal Article | ||||||||||||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||||||||||||
| Divisions: | Faculty of Science > Physics | ||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Coronal mass ejections, Coronagraphs | ||||||||||||||||||
| Journal or Publication Title: | The Astrophysical Journal | ||||||||||||||||||
| Publisher: | Institute of Physics Publishing, Inc. | ||||||||||||||||||
| ISSN: | 0004-637X | ||||||||||||||||||
| Official Date: | 14 November 2018 | ||||||||||||||||||
| Dates: |
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| Volume: | 868 | ||||||||||||||||||
| Number: | 1 | ||||||||||||||||||
| Article Number: | 18 | ||||||||||||||||||
| DOI: | 10.3847/1538-4357/aae5f6 | ||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||
| Funder: | Korea | ||||||||||||||||||
| RIOXX Funder/Project Grant: |
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