Physics
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..873c&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 13, Aug. 1986, p. 873-876. Previously announced in STAR as N86-30612.
Physics
10
Brightness, Comet Heads, Halley'S Comet, Hydrogen, Dynamics Explorer 1 Satellite, Far Ultraviolet Radiation, Imaging Techniques, Least Squares Method, Photometers
Scientific paper
The hydrogen coma of Comet Halley has been observed in resonantly scattered solar Lyman-alpha radiation during the period 4-29 January 1986 as the comet approached perihelion. These observations were obtained with the imaging photometer for vacuum-ultraviolet wavelengths on the spacecraft Dynamics Explorer 4. For the initial analysis of observations available in 17 orbits distributed throughout the period, least-squares fits are computed for the observed exponential decrease in brightness with radial distance from the nucleus. Brightness at the nucleus increased from approx. 3 to 17 kR during the observing period. Preliminary analysis yields water production rates of approx. 3.6 x 10 to the 29th power and 1.9 x 10 to the 30th power molecules/sec on 1 and 29 January, respectively.
Craven John D.
Dvorsky M. R.
Frank Louis A.
Rairden Richard L.
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