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Ion plasma waves in dusty plasmas: Halley's comet

Published online by Cambridge University Press:  13 March 2009

U. de Angelis
Affiliation:
Dipartimento di Scienze Fisiche, Universitá di Napoli, Mostra d'Oltremare pad 19, 80125 Napoli, Italy
V. Formisano
Affiliation:
Dipartimento di Scienze Fisiche, Universitá di Napoli, Mostra d'Oltremare pad 19, 80125 Napoli, Italy
M. Giordano
Affiliation:
Dipartimento di Scienze Fisiche, Universitá di Napoli, Mostra d'Oltremare pad 19, 80125 Napoli, Italy

Abstract

We investigate ion waves in a plasma in the presence of massive charged dust particles, a common space-plasma component now known to exist also in planetary rings and comets. We derive an equation describing low-frequency electrostatic perturbations on a non-homogeneous background, where the inhomogeneity is due to a distribution of charged grains, each surrounded by an equilibrium statistical distribution of plasma particles. This model is then applied to propose an interpretation of some recent data from the Vega and Giotto space probes to Halley's comet the increase of the low-frequency electrostatic noise (ion-acoustic waves) in the region of increased dust.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1988

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