Collisional electrostatic ion cyclotron waves as a possible source of energetic heavy ions in the magnetosphere

Details Collisional electrostatic ion cyclotron waves as a possible source of energetic heavy ions in the magnetosphere Collisional electrostatic ion cyclotron waves as a possible source of energetic heavy ions in the magnetosphere

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.3855p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, April 1, 1990, p. 3855-3870.

Physics

5

Collisional Plasmas, Heavy Ions, Ion Cyclotron Radiation, Magnetosphere-Ionosphere Coupling, Field Aligned Currents, Gyrofrequency, Ionospheric Ion Density, Trapped Particles

Scientific paper

A new mechanism is proposed for the source of energetic heavy ions (NO/+/, O2/+/, and O/+/) found in the magnetosphere. Simulations using a multispecies particle simulation code for resistive current-driven electrostatic ion cyclotron waves show transverse and parallel bulk heating of bottomside ionospheric heavy ion populations. The dominant mechanism for the transverse bulk heating is resonant ion heating by wave-particle ion trapping. Using a linear kinetic dispersion relation for a magnetized, collisional, homogenous, and multiion plasma, it is found that collisional electrostatic ion cyclotron waves near the NO(+), O2(+), and O(+) gyrofrequencies are unstable to field-aligned currents of 50 microA/sq m for a typical bottomside ionosphere.

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