Physics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..349v&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.349
Physics
Scientific paper
The one-dimensional thermal escape problem is studied by the direct simulation Monte Carlo method. The flow structure and the escape rate are analyzed for source Jeans parameters and Knudsen numbers ranging from 0 to 15 and from 0.0001 to ∞ , respectively. The transition in the nature of atmospheric loss from escape on a molecule-bymolecules basis, often refereed to as Jeans escape, to an organized outflow, often refereed to as hydrodynamic escape, occurs in a narrow range of the Jeans parameter. It was found that the kinetic results are different from those that are reported based on the slow hydrodynamic escape (SHE) model. In particular, the escape rates found in kinetic simulations differs only by a factor of 2 from the exobase Jeans escape. Simulations reveal only weak effect of the collision model and internal degrees of freedom of gas molecules on the escape rate.
Johnson Robert E.
Tucker Orenthal J.
Volkov Alexey N.
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