Mass loading and velocity diffusion models for heavy pickup ions at comet Grigg-Skjellerup

Details Mass loading and velocity diffusion models for heavy pickup ions at comet Grigg-Skjellerup Mass loading and velocity diffusion models for heavy pickup ions at comet Grigg-Skjellerup

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9820995h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A12, p. 20,995-21,002

Astronomy and Astrophysics

Astronomy

18

Astronomical Models, Grigg-Skjellerup Comet, Molecular Ions, Plasma Diffusion, Plasma-Particle Interactions, Solar Wind Velocity, Spaceborne Astronomy, Water, Giotto Mission, Gyrofrequency, Heavy Ions, Ion Density (Concentration), Ion Injection, Mathematical Models, Solar Wind

Scientific paper

We compare model predictions of cometary water group ion densities and the solar wind slow down with measurements made by the Giotto Johnstone plasma analyzer implanted ion sensor at the encounter with comet Grigg-Skjellerup (G-S) on July 10, 1992. The observed slope of the ion density profile on approach to the comet is unexpectedly steep. Possible explanations for this are discussed. We present also a preliminary investigation of the quasilinear velocity-space diffusion of the implanted heavy ion population at G-S using a transport equation including souce, convection, adiabatic compression, and velocity diffusion terms. Resulting distributions are anisotropic, in agreement with observations. We consider theoretically the waves that may be generated by the diffusion process for the observed solar wind conditions. At initial ion injections, waves are generated at omega approximately Omegai the ion gyrofrequency, and lower frequencies are predicted for diffusion toward a bispherical shell.

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