An Alfven wave approach to auroral field-aligned currents

Details An Alfven wave approach to auroral field-aligned currents An Alfven wave approach to auroral field-aligned currents

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983p%26ss...31..579h&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 31, May 1983, p. 579-585. Research supported by the Science and Engineering R

Statistics

Computation

5

Auroral Zones, Field Aligned Currents, Magnetohydrodynamic Waves, Plasma Currents, Space Plasmas, Cold Plasmas, Current Density, Neutral Sheets

Scientific paper

Allowing for convection, an Alfven wave generated in the neutral sheet can be stationary relative to the earth, and the hydromagnetics of a wave with an Alfven Mach number of about 0.01 predict that the wave normal should be nearly perpendicular to the magnetic field. After adopting a linear approach in the present discussion of these phenomena, computations indicated that nonlinear effects were responsible for the approximately uniform current density. Attention is given to a plasma sheet boundary crossing which illustrates the theory in virtue of allowing a first-order estimation of scale sizes to be made in the tail.

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