Observation of weak HF electrostatic turbulence in the auroral ionosphere

Computer Science – Sound

Scientific paper

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Atmospheric Turbulence, Auroral Zones, Electrostatic Waves, Ionospheric Disturbances, Ionospheric Sounding, Amplitude Distribution Analysis, Dipole Antennas, Frequency Response, Power Spectra, Rocket Sounding

Scientific paper

A numerical calculation of the cross spectrum of random signals received by two small antennas that were immersed in a two-component magnetoplasma has been conducted, for the case of a plasma model consisting of a cool and a warm component. The data were compiled by the HF electrostatic wave detection experiment of the Porcupine F3 rocket. A linear calculation of the natural electrostatic emissions detected around the electron gyrofrequency three-halves harmonic and around the upper hybrid frequency shows that their amplitudes are above the plasma thermal noise level. It is noted that the low energy precipitating suprathermal electrons present are highly anisotropic and enhance the three-halves electron gyrofrequency noise, although the electron distribution function remains stable and the most intense emissions are observed around the upper hybrid frequency.

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