Finite-Larmor-radius effect on field-aligned currents in hydromagnetic waves

Details Finite-Larmor-radius effect on field-aligned currents in hydromagnetic waves Finite-Larmor-radius effect on field-aligned currents in hydromagnetic waves

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.3397c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, April 1, 1987, p. 3397-3401.

Physics

11

Conservation Equations, Field Aligned Currents, Landau Damping, Larmor Radius, Magnetohydrodynamic Waves, Space Plasmas, Vlasov Equations, Current Sheets, Phase Velocity, Two Fluid Models

Scientific paper

Within the MHD approximation, the Alfven mode is the only hydromagnetic wave mode in which the field-aligned current can be nonzero. By means of the two-fluid equations, it is shown that the finite-Larmor-radius effect is responsible for the field-aligned currents in the fast and slow modes and for the compressibility in the Alfven mode. These results are useful in understanding the time-dependent field-aligned current sheets associated with auroral arcs with thickness down to the ion gyroradius scale.

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