Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.278..277w&link_type=abstract
In ESA, Proceedings of the International Symposium on the Diversity and Similarity of Comets p 277-282 (SEE N88-21884 14-91)
Astronomy and Astrophysics
Astronomy
2
Astronomical Models, Halley'S Comet, Magnetohydrodynamics, Abundance, Interplanetary Magnetic Fields, Magnetohydrodynamic Flow, Solar Wind, Three Dimensional Models
Scientific paper
An MHD and chemical comet coma model was applied to the plasma flow, the magnetic field, and the ion abundances in Comet Halley. By alternating iterations between axisymmetric models with detailed chemistry and three dimensional models with rigorous account of the Lorentz forces, a consistent description of the plasma flow and chemical evolution in the ionized cometary coma is derived. Models appropriate to Comet Halley in which the magnetized plasma flow, the bow shock, the magnetic cavity of size 5000 km, and the model ion abundances at 1500 km and 6000 km from the nucleus are in qualitative agreement with the Giotto data were derived. The axisymmetric model correctly shows the three groupings of ions at each distance. The model abundances for the light ions, up to 21 amu, are in very good agreement with the 1500 km observations. The comparison becomes worse at higher molecular masses and greater distances from the nucleus.
Boice Daniel C.
Huebner Walter F.
Schmidt Hans-Ulrich
Wegmann Rudolf
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