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Title: Apex Dips of Experimental Flux Ropes: Helix or Cusp?

Abstract

Here, we introduce a new theory for the presence of apex dips in certain experimental flux ropes. Previously such dips were thought to be projections of a helical loop axis generated by the kink instability. However, new evidence from experiments and simulations suggest that the feature is a 2D cusp rather than a 3D helix. The proposed mechanism for cusp formation is a density pileup region generated by nonlinear interaction of neutral gas cones emitted from fast-gas nozzles. The findings suggest that density perturbations can result in large distortions of an erupting flux rope, even in the absence of significant pressure or gravitational forces. The density pileup at the apex also suppresses the m = 1 kink mode by acting as a stationary node. Consequently, more accurate density profiles should be considered when attempting to model the stability and shape of solar and astrophysical flux ropes.

Authors:
 [1]; ORCiD logo [1]; ORCiD logo [2];  [3];  [1]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States). Applied Physics
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Division
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Mathematical Modeling and Analysis
Publication Date:
Research Org.:
California Inst. of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1574942
Grant/Contract Number:  
FG02-04ER54755
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 848; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; magnetohydrodynamics (MHD); methods: laboratory: atomic; methods: numerical; plasmas; Sun: filaments, prominences

Citation Formats

Wongwaitayakornkul, Pakorn, Haw, Magnus A., Li, Hui, Li, Shengtai, and Bellan, Paul M. Apex Dips of Experimental Flux Ropes: Helix or Cusp?. United States: N. p., 2017. Web. doi:10.3847/1538-4357/aa8990.
Wongwaitayakornkul, Pakorn, Haw, Magnus A., Li, Hui, Li, Shengtai, & Bellan, Paul M. Apex Dips of Experimental Flux Ropes: Helix or Cusp?. United States. doi:10.3847/1538-4357/aa8990.
Wongwaitayakornkul, Pakorn, Haw, Magnus A., Li, Hui, Li, Shengtai, and Bellan, Paul M. Tue . "Apex Dips of Experimental Flux Ropes: Helix or Cusp?". United States. doi:10.3847/1538-4357/aa8990. https://www.osti.gov/servlets/purl/1574942.
@article{osti_1574942,
title = {Apex Dips of Experimental Flux Ropes: Helix or Cusp?},
author = {Wongwaitayakornkul, Pakorn and Haw, Magnus A. and Li, Hui and Li, Shengtai and Bellan, Paul M.},
abstractNote = {Here, we introduce a new theory for the presence of apex dips in certain experimental flux ropes. Previously such dips were thought to be projections of a helical loop axis generated by the kink instability. However, new evidence from experiments and simulations suggest that the feature is a 2D cusp rather than a 3D helix. The proposed mechanism for cusp formation is a density pileup region generated by nonlinear interaction of neutral gas cones emitted from fast-gas nozzles. The findings suggest that density perturbations can result in large distortions of an erupting flux rope, even in the absence of significant pressure or gravitational forces. The density pileup at the apex also suppresses the m = 1 kink mode by acting as a stationary node. Consequently, more accurate density profiles should be considered when attempting to model the stability and shape of solar and astrophysical flux ropes.},
doi = {10.3847/1538-4357/aa8990},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 848,
place = {United States},
year = {2017},
month = {10}
}

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