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iCARUS 77, 414-438 (1989) Observations of the J = 1-0 CO Lines in the Mars Atmosphere
 

Summary: iCARUS 77, 414-438 (1989)
Observations of the J = 1-0 CO Lines in the Mars Atmosphere:
Radiodetection of 13COand Monitoring of 12CO
E. LELLOUCH,* M. GI~R1N,t F. COMBES,t S. ATREYA,$ AND T. ENCRENAZ*
*Ddpartement de Recherches Spatiales, Observatoire de Paris-Meudon, 92195 Meudon Principal Cedex,
France; tLaboratoire de Radio Astronomie Millim#trique, Ecole Normale Sup&ieure, 24, rue Lhomond,
75005 Paris, France; and ~-Department af Atmospheric, Oceanic and Space Sciences,
University of Michigan, Ann Arbor, Michigan 48109-2143
Received November 4, 1987; revised June 10, 1988
Repeated millimeter-wave observations of Mars, performed in September and Octo-
ber 1986 and January 1987, allowed a high-resolution recording of the J = 1-0 lzCO line,
and the first radiodetection of 13CO. In the hypothesis where the thermal profile has the
structure measured by the Vikingspacecrafts, our observations are not compatible with a
terrestrial ~CP3C isotopic ratio. If the isotope ratio is assumed terrestrial, then the
observations imply that the thermal profile is very different from the profile in dust-free
conditions, especially in its lower part, and that the CO abundance could vary by a factor
of about 2 over a period of a few months. 1989AcademicPress,Inc.
1. INTRODUCTION
Carbon monoxide is a key molecule for
understanding the aeronomical processes

  

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

 

Collections: Physics