Some recent developments in the theoretical dynamics of magnetic fields

Details Some recent developments in the theoretical dynamics of magnetic fields Some recent developments in the theoretical dynamics of magnetic fields

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph..100..309l&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 100, Oct. 1985, p. 309-331.

Physics

31

Magnetohydrodynamic Stability, Magnetostatics, Solar Magnetic Field, Solar Physics, Gravitational Effects, Linear Systems, Lines Of Force, Nonequilibrium Conditions, Space Plasmas, Sunspots

Scientific paper

This article describes recent developments in the theoretical investigation of magnetostatic equilibrium in the presence of gravity, nonequilibrium in hydromagnetics, and classical problems in hydromagnetic stability. The construction of magnetostatic equilibria has progressed beyond geometrically idealized systems, such as the axisymmetric system, to fully three-dimensional systems capable of modelling realistic solar structures. Nonequilibrium in a magnetic field with an arbitrary interweaving of lines of force due to random footprint motion is a novel and subtle property with important implications for the solar atmosphere. Work begun by Parker and subsequent developments are described. To the extent quasi-static solar structures are approximated by stable equilibrium, ideal hydromagnetic stability theory provides a first insight into how stability is achieved in the solar environment. A qualitative physical picture based on recent stability analysis is given. The article places emphasis on understanding basic principles and issues rather than detailed results which can be found in the published literature.

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