Acceleration of heavy ions on auroral field lines

Details Acceleration of heavy ions on auroral field lines Acceleration of heavy ions on auroral field lines

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..795a&link_type=abstract

Geophysical Research Letters, vol. 8, July 1981, p. 795-798.

Physics

52

Auroral Zones, Heavy Ions, Ion Cyclotron Radiation, Oxygen Ions, Particle Acceleration, Computerized Simulation, Electron Distribution, Electrostatic Waves, Hydrogen Ions, Maxwell-Boltzmann Density Function, Velocity Distribution

Scientific paper

Results of both a linear and a nonlinear study of oxygen cyclotron waves and the associated oxygen heating are presented. Linear theory predicts that oxygen cyclotron waves will have smaller growth rates than hydrogen cyclotron waves. Results of a simulation study in which the free energy source is an initial drifting electron distribution indicate that oxygen cyclotron waves only grow to small amplitudes, while the hydrogen cyclotron waves achieve larger amplitudes. In an attempt to model more realistically the continuous ionospheric outflow, a simulation model is used, in which the electron velocity distribution is maintained by a constant flow of electrons. This latter model predicts that the oxygen waves grow to amplitudes much larger than the hydrogen waves resulting in the preferential heating of the heavier ions.

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