Fr.: échappement non thermique
Same as → suprathermal escape.
Fr.: échappement suprathermal
An → atmospheric escape mechanism that occurs where individual atoms or molecules in the atmosphere are raised to → escape velocity because of chemical reactions or ionic interactions. Same as → nonthermal escape (see, e.g., Catling, D. C. and Kasting, J. F., 2017, Escape of Atmospheres to Space, pp. 129-167. Cambridge University Press).
Fr.: échappement thermique
An → atmospheric escape that occurs when irradiation from a parent star (or a very high heat flux from a planet interior) heats a planetary atmosphere, causing its molecules to escape to space. In basic models, the theory assumes neutral species with a → Maxwell-Boltzmann distribution of velocities, which occurs when collisions between molecules are frequent. Thermal escape has two types: → Jeans' escape and → hydrodynamic escape (see, e.g., Catling, D. C. and Kasting, J. F., 2017, Escape of Atmospheres to Space, pp. 129-167. Cambridge University Press).