Astrophysics (index)about

Hydrodynamic Escape

(Hydrodynamic Gas Loss)
(ongoing escape of gas particles from atmosphere)

Hydrodynamic Escape (or Hydrodynamic Gas Loss) is loss of part of an Atmosphere due to some molecules too heavy to escape via Jeans Escape (i.e., from being in the higher-velocity end of the Maxwell-Boltzmann Distribution), but are escaping from interaction with escaping lighter Particles. Thus they would not (significantly) escape except for the presence of the lighter particles. It is a type of Thermal Escape, i.e., escape of molecules due to the atmosphere's Temperature.

I believe sometimes the phrase hydrodynamic escape is used referring to Jeans escape as well, i.e., read with care.


Referenced by:
Atmosphere Formation
Atmospheric Escape
Jeans Parameter (λ)