Toward a unified view of diffuse auroral precipitation

Details Toward a unified view of diffuse auroral precipitation Toward a unified view of diffuse auroral precipitation

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.4755a&link_type=abstract

Journal of Geophysical Research, vol. 83, Oct. 1, 1978, p. 4755-4766.

Physics

17

Auroral Zones, Electron Precipitation, Electrostatic Waves, Plasma Diffusion, Proton Precipitation, Satellite Observation, Digital Simulation, Field Aligned Currents, Ion Cyclotron Radiation, Plasma Heating, Plasma Layers, Plasma Turbulence, Resonance Scattering, Thermal Plasmas

Scientific paper

The intense broadband electrostatic noise recently detected along auroral field lines provides the dominant scattering mechanism leading to the strong diffusion precipitation of plasma sheet ions responsible for the diffuse proton aurora. Emphasis is placed on surveying the conditions necessary to excite the band of ion mode turbulence. Several potential sources of free plasma energy are considered. A numerical simulation of ion mode growth is presented for two physically distinct locations using realistic magnetospheric plasma parameters. The quasi-linear diffusion of the entire plasma population by both ion and electron electrostatic waves is analyzed, and the results are applied to the diffuse auroral precipitation and the heating of thermal plasma on auroral field lines. It is concluded that cold ionospheric field-aligned current-driven instability is the most likely mechanism responsible for diffuse aurora at low altitude, but that the loss cone distribution of hot plasma sheet ions could contribute and most likely dominate at large radial distances from the earth.

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