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Title: MHD Collimation Mechanism in Arched Flux Ropes Characterized Using Volumetric, Time-Dependent B-Vector Measurements

Abstract

Laboratory measurements of B(x,t) in a volume enclosing portions of two arched flux ropes show flux rope collimation driven by gradients in axial current density. These measurements verify the three predictions of a proposed MHD collimation mechanism: (1) axial magnetic forces exist in current channels with spatially varying minor radius, (2) these forces can drive counterpropagating axial flows, and (3) this process collimates the flux rope. As a result, this mechanism may explain the axial uniformity of solar loops and is relevant to other systems with current channels of varying minor radius such as solar prominences and astrophysical jets.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
Publication Date:
Research Org.:
California Inst. of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1537298
Alternate Identifier(s):
OSTI ID: 1397314; OSTI ID: 1574934
Grant/Contract Number:  
FG02-04ER54755; SC0010471
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 44; Journal Issue: 19; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; geology; flux rope; MHD; coronal loops; laboratory plasma

Citation Formats

Haw, Magnus A., and Bellan, Paul M. MHD Collimation Mechanism in Arched Flux Ropes Characterized Using Volumetric, Time-Dependent B-Vector Measurements. United States: N. p., 2017. Web. doi:10.1002/2017gl074505.
Haw, Magnus A., & Bellan, Paul M. MHD Collimation Mechanism in Arched Flux Ropes Characterized Using Volumetric, Time-Dependent B-Vector Measurements. United States. doi:10.1002/2017gl074505.
Haw, Magnus A., and Bellan, Paul M. Fri . "MHD Collimation Mechanism in Arched Flux Ropes Characterized Using Volumetric, Time-Dependent B-Vector Measurements". United States. doi:10.1002/2017gl074505. https://www.osti.gov/servlets/purl/1537298.
@article{osti_1537298,
title = {MHD Collimation Mechanism in Arched Flux Ropes Characterized Using Volumetric, Time-Dependent B-Vector Measurements},
author = {Haw, Magnus A. and Bellan, Paul M.},
abstractNote = {Laboratory measurements of B(x,t) in a volume enclosing portions of two arched flux ropes show flux rope collimation driven by gradients in axial current density. These measurements verify the three predictions of a proposed MHD collimation mechanism: (1) axial magnetic forces exist in current channels with spatially varying minor radius, (2) these forces can drive counterpropagating axial flows, and (3) this process collimates the flux rope. As a result, this mechanism may explain the axial uniformity of solar loops and is relevant to other systems with current channels of varying minor radius such as solar prominences and astrophysical jets.},
doi = {10.1002/2017gl074505},
journal = {Geophysical Research Letters},
number = 19,
volume = 44,
place = {United States},
year = {2017},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

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Cited by: 1 work
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Figures / Tables:

Figure 1 Figure 1: (left) Collimation theory stages. (right) Fast-camera images of the double-loop experiment in these stages. Blue arrows at footpoint highlight the initially diverging current collimating over time.

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