Loss of ring current O(+) ions due to interaction with Pc 5 waves

Details Loss of ring current O(+) ions due to interaction with Pc 5 waves Loss of ring current O(+) ions due to interaction with Pc 5 waves

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98..215l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A1, p. 215-231.

Physics

12

Geomagnetic Micropulsations, Magnetohydrodynamic Waves, Oxygen Ions, Plasma Currents, Ring Currents, Wave-Particle Interactions, Magnetic Moments, Magnetic Resonance, Plasma Drift

Scientific paper

A test particle code is used here to investigate ring current ion interaction with Pc 5 waves, combined with convection and corotation electric fields, with emphasis on the loss of O(+) ions over the dayside magnetosphere. A new loss mechanism for the O(+) ions due to the combined effects of convection and corotation electric fields and interactions with Pc 5 waves via a magnetic drift-bound resonance is presented. For given fields, whether a particle gains or losses energy depends on its initial kinetic energy, pitch angle at the equatorial plane, and the position of its guiding center with respect to the azimuthal phase of the wave. The ring current O(+) ions show a dispersion in energies and L values with decreasing local time across the dayside, and a bulk shift to lower energies and higher L values. Due to interaction with the Pc 5 waves, the particle's kinetic energy can drop below that required to overcome the convection potential and the particle is lost to the dayside magnetopause by a sunward E x B drift.

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