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GALILEO PROBE MEASUREMENTS OF D/H AND 3HE/4HE IN JUPITER'S ATMOSPHERE
 

Summary: GALILEO PROBE MEASUREMENTS OF D/H AND 3HE/4HE IN
JUPITER'S ATMOSPHERE
P.R. MAHAFFY
Goddard Space Flight Center, Greenbelt, MD 20771, USA
T.M. DONAHUE and S.K. ATREYA
Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, 2455 Hayward
Street, Ann Arbor, MI 48109, USA
T.C. OWEN
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA
H.B. NIEMANN
Goddard Space Flight Center, Greenbelt, MD 20771, USA
Abstract. The Galileo Probe Mass Spectrometer measurements in the atmosphere of Jupiter give
D/H = 2:6 0:7 10,5
3
He= 4
He = 1:66 0:05 10,4
These ratios supercede earlier results by Niemann et al. (1996) and are based on a reevaluation of
the instrument response at high count rates and a more detailed study of the contributions of different
species to the mass peak at 3 amu. The D/H ratio is consistent with Voyager and ground based
data and recent spectroscopic and solar wind (SW) values obtained from the Infrared Spectroscopic

  

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

 

Collections: Physics