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Available online at www.sciencedirect.com Planetary and Space Science 51 (2003) 10131016

Summary: Available online at www.sciencedirect.com
Planetary and Space Science 51 (2003) 1013­1016
The rotational temperature and column density of H+
3 in Uranus
Th. Encrenaza;, P. Drossarta, G. Ortonb, H. Feuchtgruberc, E. Lelloucha, S.K. Atreyad
aLESIA, Observatoire de Paris, Meudon F-92190, France
bJPL, Pasadena, CA 91109, USA
cMax-Planck Institut fur Extraterrestrische Physik, Postfach 1603, Garching D-85740, Germany
dDepartment of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, MI 48109-2143, USA
Received 17 December 2002; received in revised form 25 April 2003; accepted 12 May 2003
3 emission from Uranus has been observed repeatedly for over a decade. However, the details of the emission mechanisms are still
poorly understood. In this paper, we discuss our ˙ndings from the observations we made in September 2000 and September 2001. The
spectrum of Uranus was recorded at the NASA Infrared Telescope Facility using the SpeX instrument between 3 and 5 m, with a
resolving power of 1000. The 3.4­4:1 m range permits a determination of both the H+
3 column density and its rotational temperature.
The H+
3 emission, measured at 3:986 m in the 0:8 × 3:7 arcsec aperture, was 0:031 Jy in September 2000 and 0:053 Jy in September


Source: Atreya, Sushil - Department of Atmospheric, Oceanic and Space Science, University of Michigan


Collections: Physics