Physics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9514893t&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Sept. 1, 1990, p. 14893-14904.
Physics
6
Flux Pinning, Helical Flow, Magnetohydrodynamic Turbulence, Plasma Interactions, Electric Current, Flow Velocity, Magnetic Field Configurations, Velocity Distribution
Scientific paper
A flux rope model is proposed which has a variable degree of helical distortion from axisymmetry. The basis for this suggestion is a series of numerical and analytical investigations of magnetohydrodynamic states which result when an axial electric current is directed down on dc magnetic field. The helically distorted states involve a flow velocity and seem to be favored because of their lower rate of energy dissipation. Emphasis is on the magnetometer and particle energy analyzer traces that might be characteristic of such flux ropes. It is shown that even a fractionally small helical distortion may considerably alter the traces in minimum-variance coordinates. In short, what may be fairly common MHD processes can render a flux rope almost unrecognizable under standard diagnostics, even if the departures from axisymmetry are not great.
Montgomery David
Theobald Michael L.
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