Astrophysics (Index)About

Jeans parameter

(λ, Jeans escape parameter, escape parameter)
(ratio measuring a tendency of an atmosphere to escape)

The Jeans parameter is a measure of an atmosphere's tendency to escape (atmospheric escape) through a thermal escape mechanism (Jeans escape or hydrodynamic escape). It is a ratio of the gravitational potential energy of particles in the atmosphere to their kinetic energy. In a (virtually) spherically-symmetric situation, it is a function of distance from the center of the body. The smaller the Jeans parameter, the more likely the escape, and thresholds have been devised to indicate whether such escape is a significant possibility.


(atmosphere,gas,planets,measure,ratio)
Further reading:
https://ui.adsabs.harvard.edu/abs/2011ApJ...729L..24V/abstract
http://wray.eas.gatech.edu/physicsplanets2012/LectureNotes/Lecture26.pdf
https://www.cs.trinity.edu/~mlewis/PlAtm/Jeans.html
https://sci.esa.int/documents/33745/35957/1567254269996-07_Lammer.pdf

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