Gaseous outbursts in Comet P/Halley - A model for the dissociation of the OH radical

Details Gaseous outbursts in Comet P/Halley - A model for the dissociation of the OH radical Gaseous outbursts in Comet P/Halley - A model for the dissociation of the OH radical

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...201..350s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 201, no. 2, Aug. 1988, p. 350-354.

Astronomy and Astrophysics

Astrophysics

6

Astronomical Spectroscopy, Cometary Atmospheres, Gas Evolution, Halley'S Comet, Hydroxyl Radicals, Astronomical Models, Outgassing, Radio Spectra

Scientific paper

An outburst and the consequent global evolution of gas in the coma of comet Halley observed during the period March 24-29, 1986 is modelled. A rise in the gaseous production rate by a factor of 2.5 in one day was detected in the radio and ultraviolet transitions of the OH radical. To model this outburst and the time evolution of the total content of gas in the coma, the ultraviolet data of CS and the radio data of OH are used. Three other bursts were detected during the radio monitoring of comet Halley. Based on the time decay of these OH bursts, a new method to calculate the photochemical lifetimes of OH and H2O is proposed. The lifetimes of the OH molecules in the radiation field of the sun depend strongly on the comet's heliocentric velocity. The calculated lifetimes of OH in P/Halley at 1 AU from the sun change between 2.0 x 10 to the 5th and 4.7 x 10 to the 5th s for heliocentric radial velocities that vary between -27 km/s and + 27 km/s.

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