Quasi-linear pitch angle and energy diffusion of pickup ions near Comet Halley

Details Quasi-linear pitch angle and energy diffusion of pickup ions near Comet Halley Quasi-linear pitch angle and energy diffusion of pickup ions near Comet Halley

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9621329h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Dec. 1, 1991, p. 21,329-21,341. Research supported by SERC, BMFT, NAS

Physics

8

Halley'S Comet, Ion Distribution, Magnetohydrodynamic Turbulence, Solar Wind, Giotto Mission, Kinetic Equations, Spectrum Analysis, Stream Functions (Fluids), Transport Theory, Upstream

Scientific paper

The process of ion pickup in the environment of Halley's comet is studied in order to see if velocity diffusion driven by the observed level of turbulence can explain the observed development of the implanted ion distribution. The theoretical description used is based on a quasi-linear approach and considers the implantation and transport of cometary ions along solar wind flow lines. To make such a study requires some way of extrapolating the measurements on the Giotto trajectory into the upstream region; models for mass loading and turbulence are used. A simplified kinetic equation describing the source, convection, and quasi-linear velocity diffusion of the heavy cometary ions is solved numerically along flow lines parallel to the sun-comet line. Full two-dimensional (pitch angle and velocity) distributions are obtained at positions along the Giotto trajectory, which are compared with measurements. This study finds that quasi-linear theory, with the empirical model for the observed turbulence level, produces the right order of pitch angle diffusion.

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