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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

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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
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:
DateEvent
14 November 2018Published
1 October 2018Accepted
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:
Project/Grant IDRIOXX Funder NameFunder ID
NRF-2016R1A2B4013131Ministry of Education, Science and Technologyhttp://dx.doi.org/10.13039/501100004085
NRF-2013M1A3A3A02042232National Research Foundation of Koreahttp://dx.doi.org/10.13039/501100003725
2017-1-851-00Ministry of Science ICT and Future PlanningUNSPECIFIED
2018-0-01422Ministry of Science ICT and Future PlanningUNSPECIFIED
ST/P000320/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
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