Astronomy and Astrophysics – Astronomy
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ssrv...18..641k&link_type=abstract
Space Science Reviews, vol. 18, Mar.-May 1976, p. 641-684.
Astronomy and Astrophysics
Astronomy
46
Comet Nuclei, Comets, Lyman Alpha Radiation, Spaceborne Astronomy, Ultraviolet Spectra, Ice Formation, Light Scattering, Line Shape, Oao 2, Ogo-5, Satellite Observation, Water
Scientific paper
The paper summarizes recent cometary UV observations, most of which were made in Ly-alpha light with instruments aboard earth-orbiting satellites. These include OAO-2 observations of comets Bennett and Tago-Sato-Kosaka, OGO-5 observations of comets Bennett and Encke, and numerous observations of comet Kohoutek. Models for the production of cometary hydrogen atoms are described, including the fountain, syndyname, and parent-daughter models. Calculations of emission line profiles and multiple-scattering effects are also discussed. Results of observations and interpretations are reviewed for each cited comet, far-UV observations in other emission lines are noted, and the use of comets as solar-wind probes is considered. It is concluded that the results of the present cometary Ly-alpha observations strongly support the concept of an icy conglomerate solid cometary nucleus and suggest water to be one of the most abundant molecules in comets.
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