Heating of ionospheric O(+) ions by shear Alfven waves

Details Heating of ionospheric O(+) ions by shear Alfven waves Heating of ionospheric O(+) ions by shear Alfven waves

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.5911w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, June 1, 1987, p. 5911-5919.

Physics

19

Ionospheric Heating, Magnetohydrodynamic Waves, Oxygen Ions, Positive Ions, Space Plasmas, Dielectric Properties, Hydrogen Ions, S Waves, Tensor Analysis, Wave Attenuation, Wave Equations

Scientific paper

Ionospheric ions, in particular O(+) ions, which have been transversely heated, are often observed flowing upward along auroral field lines. A new mechanism, heating by current-driven shear (or kinetic) Alfven waves (SAW), is proposed. An electron current drives oblique SAWs unstable near a wave frequency of about the oxygen cyclotron frequency, and these waves are in turn gyroresonantly absorbed by the ions. The mechanism is similar to ion heating by current-driven electrostatic ion cyclotron waves (EICW). However, the SAW differs from the EICW in that as the perpendicular temperature of the ions increases, growth of the SAW can still occur, whereas growth of the EICW becomes suppressed. As a consequence, the SAW is able to provide sustained perpendicular heating of ions with smaller currents being required for the heating than for heating via EICWs.

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