Profiles of the major gas emissions and distribution of dust particles in the inner coma (0 to 10,000 km) of Comet Halley

Details Profiles of the major gas emissions and distribution of dust particles in the inner coma (0 to 10,000 km) of Comet Halley Profiles of the major gas emissions and distribution of dust particles in the inner coma (0 to 10,000 km) of Comet Halley

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.278..255p&link_type=abstract

In ESA, Proceedings of the International Symposium on the Diversity and Similarity of Comets p 255-262 (SEE N88-21884 14-91)

Computer Science

2

Cometary Atmospheres, Cosmic Dust, Gas Analysis, Halley'S Comet, Free Radicals, Optical Emission Spectroscopy, Spatial Distribution, Vega Project

Scientific paper

Spectroscopic observations of the inner coma of Comet Halley in the visible range were obtained on March 9, 1986 by the TKS spectrometer on VEGA-2. The dust distribution spatial structure indicates that solid particle ejection is restricted inside a cone whose axis lies in the direction of the Sun. This is believed to be due to the fact that the path of the observed particles is not affected enough by collisions with neutral molecules to populate the entire space around the nucleus. The distribution of gases around the nucleus is isotropic, even near the nucleus where it is supposed to be released from well defined active areas. The observed distributions of the CN, C2, and C3 radicals are fully compatible with a one-step production chain. The OH profiles seem to be anomalous below distances of the order of 600 km, which can be explained by taking into account the strong absorption of the solar flux by water vapor that should occur there.

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