Generation of ion-conic distribution by upgoing ionospheric electrons

Details Generation of ion-conic distribution by upgoing ionospheric electrons Generation of ion-conic distribution by upgoing ionospheric electrons

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.7627d&link_type=abstract

Journal of Geophysical Research, vol. 86, Sept. 1, 1981, p. 7627-7638.

Physics

99

Ion Cyclotron Radiation, Ion Distribution, Ionospheric Ion Density, Plasma Waves, Plasma-Particle Interactions, Space Plasmas, Auroras, Diffusion Coefficient, Electron Precipitation, High Energy Electrons, Ionic Diffusion, Ionospheric Currents, Power Spectra, Wave Generation

Scientific paper

The quasi-linear relaxation of ionospheric ion distributions in resonance with electrostatic ion-cyclotron waves is investigated to determine which parameters describing waves or particles are significant in the heating and acceleration process. Downward currents in auroral regions are measured with amplitudes of 1-5 microamps/sq m, and the Cartesian components in velocity space are considered for the case of ion-conic diffusion. The time scale for changes in the space average distribution function which is much longer than the average wave period of the turbulence is shown to be satisfied for the interaction of the ion-cyclotron waves with ionospheric ions. Wave generation is discussed, and it is found that the keV electron precipitation in upward current regions cannot be responsible for the excitation of ion-cyclotron waves. The quasi-linear diffusion coefficient is evaluated, and the behavior of distribution of particles constrained to diffuse on surfaces are investigated. Diffusion coefficients are calculated, and the number of fluxes as a function of perpendicular velocity are compared with measured fluxes. It is concluded that the quasi-linear interaction of electrostatic ion-cyclotron waves with a thermal distribution of ions offers a quantitative explanation of the generation of ion-conics.

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