Large-scale field-aligned plasma flows

Details Large-scale field-aligned plasma flows Large-scale field-aligned plasma flows

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.1385h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A2, p. 1385-1391.

Physics

1

Boltzmann Transport Equation, Collisionless Plasmas, Field Aligned Currents, Magnetohydrodynamic Flow, Plasma Density, Plasma Pressure, Electric Fields, Heat Transmission, Magnetic Field Configurations, Pressure Gradients

Scientific paper

Stationary, large scale plasma flows along the field lines are analyzed using the first three moments of the collisionless Boltzmann equation. The number of integrals of motion which can be found is restricted not only by the cutoff of the hierarchy of the moment equations but also by the forms of the available first-order partial differential equations which often do not satisfy Cauchy condition of integrability. Only three integrals of motion exist for the plasma continuum described by plasma density, velocity, two components of the pressure tensor and two components of the heat flow tensor. The equation for the field-aligned current, which is algebraic in j-parallel, is derived. It expresses the field-aligned current as function of the perpendicular electric field and perpendicular gradients of the pressure components and of the magnetic field strength determined at the investigated point of the field line.

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