Analysis of the Pioneer-Venus Lyman-alpha image of the hydrogen coma of Comet P/Halley

Details Analysis of the Pioneer-Venus Lyman-alpha image of the hydrogen coma of Comet P/Halley Analysis of the Pioneer-Venus Lyman-alpha image of the hydrogen coma of Comet P/Halley

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...253.1008s&link_type=abstract

Science (ISSN 0036-8075), vol. 253, Aug. 30, 1991, p. 1008-1010.

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Halley'S Comet, Hydrogen Atoms, Lyman Alpha Radiation, Pioneer Venus Spacecraft, Ultraviolet Spectrometers, Astronomical Models, Coma, Cometary Atmospheres

Scientific paper

Comet Halley passed within 0.27 astronomical unit of Venus on February 4, 1986, 5 days before perihelion. This provided a unique opportunity to observe the comet's coma with the ultraviolet spectrometer orbiting the planet aboard the Pioneer Venus Orbiter spacecraft when the coma was otherwise obscured from earth's view by the sun's glare. More than 9000 data points acquired systematically over the 5-day period from 2 to 6 February were combined to construct an excellent Lyman-alpha image of the hydrogen coma. The Lyman-alpha image was successfully reproduced with a comprehensive physical model, thereby verifying and documenting the underlying chemical kinetics and dynamics of the hydrogen coma.

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