Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232..318f&link_type=abstract
Astrophysical Journal, Part 1, vol. 232, Aug. 15, 1979, p. 318-328.
Astronomy and Astrophysics
Astronomy
14
Astronomical Spectroscopy, Comets, Lyman Alpha Radiation, Oao 3, Spaceborne Astronomy, Ultraviolet Astronomy, Emission Spectra, Hydrogen Atoms, Molecular Spectra, Optical Thickness, Photodissociation
Scientific paper
Observations of L-alpha emission from comet Kobayashi-Berger-Milon (1975 IX) by the Copernicus satellite revealed a variation of line width with distance from the nucleus. The broad emission profile near the center of the coma is due to a dominating high-velocity component of hydrogen atoms. The narrower profile observed at 2 to 7 arcmin from the coma requires a lower-velocity component to be produced in an extended source region from a different parent molecule and/or a different dissociation process. This behavior is consistent with the two-step photodissociation of water producing hydrogen atoms with velocities of 20 and 6-8 km/sec, respectively. The absolute intensity of L-alpha emission yields a production rate of (4.4 + or - 1.4) x 10 to the 28th H2O molecules/sec at a heliocentric distance of 1.03 AU before perihelion.
Barker Edwin S.
Bertaux Jean Loup
Drake James F.
Festou Michel
Jenkins Edward B.
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