Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm...p41b08m&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #P41B-08
Physics
0343 Planetary Atmospheres (5405, 5407, 5409, 5704, 5705, 5707), 5405 Atmospheres--Composition And Chemistry, 5409 Atmospheres--Structure And Dynamics, 5704 Atmospheres--Composition And Chemistry, 5707 Atmospheres--Structure And Dynamics
Scientific paper
Recently a number of remote and insitu observations of Ganymede have indicated that Ganymede has a substantial atmosphere. Hall et al. (ApJ 499, 475, 1998) interpreted HST UV observations of Ganymede as indicating the presence of an O2 column between 1 and 10 x 1014 cm-2 concentrated about the poles of Ganymede and suggested a sputtering source. Barth et al.(GRL 24, 2147, 1997) detected H with the Galileo UV spectrometer and estimated a column for H of \approx 5 x 1012 cm-2. In addition Galileo photopolarimeter radiometer observations of the surface have been interpreted as indicating maximum temperatures of 152 K (Orton et al. 1996, Science 274, 389). Taking this temperature at face value together with the high coverage of water-ice on Ganymede's surface suggests that there should also be a significant H2O sublimation atmosphere concentrated near the subsolar point. The type of atmosphere indicated by the observations is quite tenuous; but still sufficiently thick for collisions to be important. As a result, we utilize a multispecies 2 D axisymmetric hybrid fluid/kinetic approach for the calculation of Ganymede's neutral atmosphere (a 1D version is described in Marconi et al. 1996, ApJ 469, 393). The atmosphere is assumed to be composed of H2O, OH, O, H, H2, and O2. Photodissociation, neutral- neutral chemistry, and electron impact dissociation processes are included. Results will be presented for various scenarios, including an atmosphere generated by an H2 sublimation atmospheric source only, by a polar cap sputtering source only, and a combination of both sources.
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