Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9820985c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A12, p. 20,985-20,994
Astronomy and Astrophysics
Astronomy
41
Grigg-Skjellerup Comet, Molecular Ions, Plasma Diffusion, Plasma-Particle Interactions, Solar Wind, Solar Wind Velocity, Spaceborne Astronomy, Water, Energy Distribution, Energy Transfer, Field Aligned Currents, Giotto Mission
Scientific paper
The diffusion of water group cometary ions in velocity space at comet Grigg-Skjellerup was measured during the Giotto spacecraft encounter. The evolution of the collapsed pitch angle and energy distributions during the inbound and outbound passes shows that the timescale for energy diffusion may be similar to that for pitch angle diffusion. Fully isotropic pitch angle distributions were never seen. Also the bulk parameters of the three-dimensional distributions are examined. Transformation of these parameters into a field-aligned solar wind frame allows us to test the gyrotropy of the distributions. These observations imply that there were deviations from gyrotropy throughout the encounter becoming most important near to closest approach.
Coates Andrew J.
Johnstone Alan D.
Neubauer Fritz Manfred
Wilken Berend
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