MHD collimation mechanism in arched flux ropes characterized using volumetric, time-dependent B-vector measurements
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. 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.
© 2017 American Geophysical Union. Received 12 JUN 2017; Accepted 26 AUG 2017; Accepted article online 1 SEP 2017; Published online 4 OCT 2017. This work was supported by NSF under award 1348393, AFOSR under award FA9550-11-1-0184, and DOE under awards DE-FG02-04ER54755 and DE-SC0010471. The associated data files and plotting scripts for this paper are available here: github.com/magnus-haw/3D-B-Doubleloop.
Published - Haw_et_al-2017-Geophysical_Research_Letters.pdf
Supplemental Material - 2017GL074505-sup-0001-Data_20Set_20SI-S01_AA.gz
Supplemental Material - 2017GL074505-sup-0002-Supporting_20Information_20SI-S01_AA.pdf
Supplemental Material - 2017GL074505-sup-0003-Movie_20SI-S01_AA.mp4
Supplemental Material - 2017GL074505-sup-0004-Movie_20SI-S02_AA.mp4
Supplemental Material - 2017GL074505-sup-0005-Movie_20SI-S03_AA.mpeg
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