TY - JOUR
T1 - The influence of collisions and thermal escape in Callisto's atmosphere
AU - Carberry Mogan, Shane R.
AU - Tucker, Orenthal J.
AU - Johnson, Robert E.
AU - Sreenivasan, Katepalli R.
AU - Kumar, Sunil
N1 - Funding Information:
This work is supported by grant 80NSSC19M0073 from NASA Goddard Space Flight Center's Solar System Exploration Division. Simulations were carried out on the High Performance Computing resources at NYU Abu Dhabi and was supported in part through the NYU IT High Performance Computing resources, services, and staff expertise.
PY - 2020/12
Y1 - 2020/12
N2 - A molecular kinetic method is applied to simulate intermolecular collisions and thermal escape in single and multi-component Callisto-like atmospheres. The 1D atmospheres at noon and midnight are composed of radiolytically produced volatiles (CO2, O2, H2) which are assumed to permeate the regolith and thermally desorb. The escaping H2 is shown to have a critical effect on the atmosphere as it is the dominant collision partner, it cools the background gases producing non-isothermal profiles, and its diffusion through the O2 and CO2 affects the vertical structure. Therefore, at the densities inferred from observations, molecular collisions must be included when describing the structure of and escape from Callisto's atmosphere.
AB - A molecular kinetic method is applied to simulate intermolecular collisions and thermal escape in single and multi-component Callisto-like atmospheres. The 1D atmospheres at noon and midnight are composed of radiolytically produced volatiles (CO2, O2, H2) which are assumed to permeate the regolith and thermally desorb. The escaping H2 is shown to have a critical effect on the atmosphere as it is the dominant collision partner, it cools the background gases producing non-isothermal profiles, and its diffusion through the O2 and CO2 affects the vertical structure. Therefore, at the densities inferred from observations, molecular collisions must be included when describing the structure of and escape from Callisto's atmosphere.
KW - Atmospheres, composition
KW - Atmospheres, dynamics
KW - Atmospheres, structure
KW - Callisto
KW - Satellites, atmospheres
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U2 - 10.1016/j.icarus.2020.113932
DO - 10.1016/j.icarus.2020.113932
M3 - Article
AN - SCOPUS:85089655225
SN - 0019-1035
VL - 352
JO - Icarus
JF - Icarus
M1 - 113932
ER -