Shot noise generated by gas impact during a cometary fly-by

Details Shot noise generated by gas impact during a cometary fly-by Shot noise generated by gas impact during a cometary fly-by

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983spii.nasa..151g&link_type=abstract

In ESA Spacecraft/Plasma Interactions and their Influence on Field and Particle Meas. p 151-159 (SEE N84-17253 08-18)

Physics

Gas-Solid Interactions, Halley'S Comet, Satellite Antennas, Shot Noise, Vega Project, Comet Nuclei, Neutral Gases, Noise Spectra, Solar Wind

Scientific paper

The spectrum of shot noise detected by a satellite electric field sensor made of two spheres in the solar wind and at various distances from the nucleus of comet Halley is predicted. The interaction between the antenna and the cometary gas flow is analyzed. At low frequencies, the noise is dominated by the effect of escaping or collected particles, and the distribution varies. At intermediate frequencies, the role of the trapped particles is preponderant, and the spectrum is flat. At high frequencies, above the inverse bounce period, the noise spectrum decreases. The noise level can be reduced by using meshed probes which have a smaller collecting area. This approach is particularly efficient at frequencies 1 kHz for spheres 5 cm in radius; the antenna impedance is then mostly capacitive and a reduction of its conductance has no significant effect.

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