Physics – Fluid Dynamics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gapfd..21..237b&link_type=abstract
Geophysical and Astrophysical Fluid Dynamics, vol. 21, no. 3-4, 1982, p. 237-263. Research supported by the Science Research Co
Physics
Fluid Dynamics
15
Magnetic Flux, Solar Magnetic Field, Stellar Models, Bessel Functions, Boundary Conditions, Boundary Value Problems, Pressure Distribution, Pressure Effects, Solar Atmosphere, Thickness
Scientific paper
While most previous investigations have concentrated on slender flux tubes, the present study of the equilibrium structure of an axisymmetric magnetic flux tube, confined by an external pressure that varies along the length of the tube, explores the properties of thick tubes in order to establish the degree to which slender tube theory is valid. It is found that slender flux tube results may in some cases give no indication of thick tube behavior in a nonuniform atmosphere. Depending on boundary conditions applied at the ends of the tube, it may expand or contract upon entering a region of increasing pressure. Rather than expanding indefinitely, the tube surface may form a cusped shape when a point of external pressure on the tube surface falls to equality with the internal pressure. Numerical solutions for an initially uniform tube give smaller expansions than would be expected from slender tube theory.
Browning Philippa K.
Priest Eric R.
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