Physics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88..899o&link_type=abstract
Journal of Geophysical Research, vol. 88, Feb. 1, 1983, p. 899-915.
Physics
46
Auroral Zones, Electrostatic Waves, Hydrogen Ions, Particle Acceleration, Conics, Ion Cyclotron Radiation, Ion Temperature, Lines Of Force, Plasma Turbulence, Temporal Distribution
Scientific paper
Electrostatic ion cyclotron turbulence and the formation of ion conics at low altitudes (about 1500 km) along auroral field lines have been investigated analytically and by plasma numerical simulations. Ion cyclotron waves are assumed to be driven unstable by the upgoing cold ionospheric electrons associated with the downward auroral current. When the electron drift speed is comparable to the electron thermal speed, it was found that the large-amplitude (the saturation level is approximately equal to unity) coherent (omega equals the ion gyrofrequency) ion cyclotron waves should exist along auroral field lines at low altitudes extending a few hundred kilometers. Ion conics are associated with ion cyclotron turbulence, and the ion bulk temperature is found to increase by a factor of 10 from the initial ionospheric temperature, while the temperature of the high-energy tail can be as much as 100 times the ionospheric temperature. Theory and simulations are in good agreement.
Ashour-Abdalla Maha
Okuda Haruyuki
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