Physics
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8.1249s&link_type=abstract
Geophysical Research Letters, vol. 8, Dec. 1981, p. 1249-1252.
Physics
41
Electrostatic Waves, Hydrogen Plasma, Ion Cyclotron Radiation, Ionospheric Ion Density, Plasma-Particle Interactions, Equations Of Motion, Helium Ions, Oxygen Ions, Particle Acceleration, Stochastic Processes
Scientific paper
Interactions between ionospheric ions and electrostatic hydrogen cyclotron waves are studied numerically in an investigation of a possible mechanism for the energization of the low-energy ionospheric ions flowing along geomagnetic field lines to high altitudes. Ion equations of motion are solved numerically for a given number of O(+), He(+) and He(2+) ions initially in a Maxwellian distribution. All the ions considered are found capable of undergoing stochastic acceleration by a coherent electrostatic hydrogen cyclotron wave with parameters typical of the auroral plasma above 1 earth radius. The fraction of the initial ion population undergoing heating depends strongly on the mass, charge and initial temperature of the ion species, with O(+) ions only heated when their initial temperature is approximately greater than the hydrogen temperature and the lighter ions able to be heated even when cold, due to cyclotron resonant stochastic heating.
Schunk Robert W.
Singh Navinder
Sojka Jan J.
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