Computer Science – Sound
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338.1115d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 338, March 15, 1989, p. 1115-1121.
Computer Science
Sound
12
Halley'S Comet, Oxygen Spectra, Ultraviolet Spectra, Asymmetry, Brightness Distribution, Coma, Emission Spectra, Far Ultraviolet Radiation, Sounding Rockets, Water, Comets, Halley, Emissions, Ultraviolet, Wavelengths, Spectra, Comae, Symmetry, Brightness, Distribution, Velocity, Oxygen, Comparisons, Water, Origin, Source, Distance, Calculations, Analysis, Diagrams, Parameters, Photodissociation, Satellite Observations
Scientific paper
Far-ultraviolet spectra of Comet Halley (1986 III) were obtained on February 26, 1986, 17 days after perihelion, and on March 13, 1986, 13 hr before the Giotto encounter, using an imaging spectrograph aboard a sounding rocket. A sunward-antisunward asymmetry observed in the brightness distribution of the O I 1302A emission is a result of the differential Swings effect first discussed by Greenstein (1958) for Fraunhofer structure in the solar continuum. The mean velocity of the O atoms in the coma at cometocentric radii greater than 10,000 km was 2.2 + or - 0.8 km/s based on model calculations which incorporate the Greenstein effect. This velocity is consistent with H2O as the principal source of oxygen.
Dymond Ken F.
Feldman Paul D.
Woods Thomas N.
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