An amended magnetohydrodynamic equation which predicts field-aligned current sheets

Details An amended magnetohydrodynamic equation which predicts field-aligned current sheets An amended magnetohydrodynamic equation which predicts field-aligned current sheets

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.137..385s&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 137, no. 2, Oct. 1987, p. 385-395.

Astronomy and Astrophysics

Astrophysics

5

Current Sheets, Field Aligned Currents, Magnetic Field Configurations, Magnetohydrodynamic Waves, Planetary Magnetic Fields, Plasma Equilibrium, Earth Magnetosphere, Equations Of Motion, Lorentz Transformations

Scientific paper

A derivation of the physical conditions for magnetohydrodynamic equilibrium from first principles establishes a set of equations which differ slightly from the usual ones. The difference is only relevant in the special case when the current is parallel to the magnetic field. What is noteworthy is that these modified equations predict that the simplest magnetohydrodynamic equilibria can only exist in regions of field-aligned current sheets. This prediction is entirely consistent with the observed large-scale structures in the Earth's magnetosphere.

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