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In situ gas and ion measurements at comet Halley (1986)

Eberhardt, P. ; Laemmerzahl, P. ; Woweries, J. ; [et al.]

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Publication Date: 2019-07-12

Description: The Giotto space probe's neutral mass spectrometer experiment has determined the abundances and the chemical, elemental and isotopic compositions of gases and low energy ions in the coma of comet Halley. Preliminary results show water predominating, at about 80 percent by volume, with a density of 4.7 x 10 to the 7th molecules/cu cm at 1000 km and a photodestruction scale length of 39,000 km. Limits on the abundances of CO2, NH3 and CH4 relative to H2O are also obtained. An ion temperature change observation indicates a contact surface location at 47,000 + or - 200 km.

Keywords: ASTROPHYSICS

Type: Nature (ISSN 0028-0836); 321; 326-329

Format: text

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