Observations of the OH radical in comet C/1996 B2 (Hyakutake) with the Nançay radio telescope
Gérard, E. and Crovisier, J. and Colom, P. and Biver, N. and Bockelée-Morvan, D. and Rauer, H. (1998) Observations of the OH radical in comet C/1996 B2 (Hyakutake) with the Nançay radio telescope. Planetary and Space Science, 46 (5), pp. 569-577.
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The 18-cm lines of the OH radical were monitored in C/1996 B2 (Hyakutake) with the Nançay radio telescope between March 1 and May 18, 1996. Besides providing regular measurements of the water production rate, the C/1996 B2 campaign was useful to test and improve existing models of the OH density, excitation and transfer because the comet passed successively close to the Earth and close to the Sun. At the time of closest approach to Earth, a rough mapping was made by observing at offset positions several beamwidths (3.5') from the nucleus together with the centre position. The OH line intensity at the centre was comparable to those at offset positions, providing direct evidence for collisional quenching of the OH maser in the inner coma. After removing the Greenstein effect, the line profiles suggest a slight excess outgassing towards the Sun. We were able to detect the OH satellite lines at 1612 and 1721 MHz. A weak Zeeman splitting of the 1667 and 1665 MHz transitions was observed corresponding to an avera line-of-sight magnetic field in the range +5 to +10 nT.
|Title:||Observations of the OH radical in comet C/1996 B2 (Hyakutake) with the Nançay radio telescope|
|Journal or Publication Title:||Planetary and Space Science|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 569-577|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W EW - Erforschung des Weltraums|
|DLR - Research area:||Space|
|DLR - Program:||W EW - Erforschung des Weltraums|
|DLR - Research theme (Project):||UNSPECIFIED|
|Institutes and Institutions:||Institute of Planetary Research > Institut für Planetenerkundung|
|Deposited By:||Susanne Pieth|
|Deposited On:||16 Sep 2005|
|Last Modified:||14 Jan 2010 15:44|
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