Surface currents on models of force-free solar magnetic flux tubes.

Details Surface currents on models of force-free solar magnetic flux tubes. Surface currents on models of force-free solar magnetic flux tubes.

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jplph..51..163m&link_type=abstract

Journal of Plasma Physics, Vol. 51, No. 1, p. 163 - 176

Physics

Plasma Physics

9

Solar Magnetic Fields, Magnetic Flux Tubes: Sun

Scientific paper

A model of a cylindrically symmetric, force-free magnetic field consisting of a sequence of concentric layers with piecewise-constant α is used to construct models of the surface currents on isolated, force-free magnetic flux tubes. Two boundary conditions are considered: a current-neutralized flux tube and an isolated current-carrying flux tube. A single-α model that is current-neutralized is a reverse-field pinch, and is unacceptable as a model for a solar flux tube. Examples of two-α models for a current-neutralized flux tube are presented. The models of the surface currents satisfying either boundary condition are shown to simplify considerably when the surface layer is thin. A model consisting of several layers, with piecewise-constant α, may be used to find an approximate solution for a force-free flux tube with an arbitrarily specified current profile.

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