Correlation of auroral hiss and upward electron beams near the polar cusp

Details Correlation of auroral hiss and upward electron beams near the polar cusp Correlation of auroral hiss and upward electron beams near the polar cusp

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89..925l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Feb. 1, 1984, p. 925-935. Navy-supported research.

Physics

68

Auroral Zones, Electron Beams, Electrostatic Waves, Hiss, Polar Cusps, Polar Regions, Whistlers, Beam Plasma Amplifiers, Dynamics Explorer 1 Satellite, Ionospheric Electron Density, Magnetohydrodynamic Stability, Maxwell-Boltzmann Density Function, Plasma Resonance

Scientific paper

Data were obtained from the DE-1 high-altitude plasma instrument (HAPI) and plasma wave instrument (PWI) during outbound passes through the polar cusp near local noon. The observed distribution functions of electron beams are fitted by drifting Maxwellian functions and the observed distribution functions of hot background electrons by isotropic Maxwellian functions. In addition, the cold plasma density is inferred from knowledge of the electron plasma frequency and the measured density of the warm plasma, including the electron beam distribution. The empirically fitted plasma parameters, including density, temperature and drifting energy, are used to solve the linear dispersion equation for the resulting whistler mode emissions. Because the whistler mode becomes quasi-electrostatic for wave-normal angles near the resonance cone, the electrostatic approximation is used for the whistler mode dispersion relation. The results of wave instability analyses are then compared with the wave observations. A ray tracing of cusp hiss emission is conducted to locate the wave source region (at about one earth-radius).

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