Ultraviolet features of Comet Halley observed by Suisei

Details Ultraviolet features of Comet Halley observed by Suisei Ultraviolet features of Comet Halley observed by Suisei

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.397k&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 397-402 (SEE N87

Other

6

Cometary Atmospheres, Halley'S Comet, Hydrogen, Japanese Spacecraft, Ultraviolet Spectroscopy, Comet Nuclei, Lyman Alpha Radiation, Periodic Variations, Photodissociation

Scientific paper

Strong breathing of comet Halley with a period of 2.2 days was continuously observed throughout all phases in the present apparition from November 14, 1985 to April 14, 1986. Concerning to the water production, postperihelion rates exceeded the preperihelion ones by factor 2 or 3. This fact suggests a postperihelion heating of the cometary nucleus. Some fine structures in the Lyman alpha photometry data taken at the encounter indicate spatial variations of the atomic hydrogen density in the coma. These may correspond to shell structures in image datas so far obtained and be ascribed to the presence of a hydrogen source other than H2O in the cometary gas or dust particles. This second hydrogen source is expected to have a great value of photo-dissociation rate in comparison to that of H2O.

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