Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.589g&link_type=abstract
In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 589-594 (SEE N87
Astronomy and Astrophysics
Astronomy
9
Centimeter Waves, Halley'S Comet, Hydroxyl Radicals, Radio Astronomy, Kinematics, Molecular Excitation, Periodic Variations, Velocity Distribution
Scientific paper
The 1667 MHz and 1665 MHz transitions of the OH radical were detected and monitored nearly daily in comet Halley 1982i with the Nançay radio telescope. The observations cover the period July 1985 to July 1986 and provide a unique test for the excitation mechanisms of the OH molecule and the kinematic models of the OH coma. The heliocentric velocity range was fully observed between -26.8 and 26.8 km s-1 and 6 line reversals were observed. The OH parent production rate of P/Halley was measured between 3.4 and 0.6 AU from the Sun. The authors find new effects like significant short-term variations of the OH parent production rate in a few days, large variations of the half power profile width and anomalous line shapes.
Bockelée-Morvan Dominique
Bourgois Gabriel
Colom Pierre
Crovisier Jacques
Gerard Emmanuelle
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