Modern exospheric theories and their observational relevance

Details Modern exospheric theories and their observational relevance Modern exospheric theories and their observational relevance

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983rvgsp..21...75f&link_type=abstract

Reviews of Geophysics and Space Physics, vol. 21, Feb. 1983, p. 75-124. Research supported by the Natural Sciences and Engineer

Physics

77

Atmospheric Models, Collision Parameters, Exosphere, Kinetic Theory, Monte Carlo Method, Planetary Atmospheres, Atmospheric Physics, Atmospheric Temperature, Diurnal Variations, Maxwell-Boltzmann Density Function, Thermosphere, Velocity Distribution

Scientific paper

Kinetic theory models for planetary exospheres, the outer regions of an atmosphere where density becomes negligible, are reviewed, together with the implications for satellite and ground-based observations. Particular note is made of the area between the thermosphere and the exosphere, where particle conditions are in transition from collisional to noncollisional. A spherically symmetric collisionless model is employed to calculate the velocity distribution function. Consideration is given to modifying parameters such as planetary rotation, a nonuniform exobasic density, and temperature distributions. An assessment is made of the effectiveness of the models for describing observed exospheric characteristics, with emphasis on the lack of an abrupt physical cut-off between collisional and noncollisional regions. Finally, features of collisional models, which take into account escape-induced non-Maxwellian effects, temperature structure modifications, nonthermal escape processes, and satellite particle populations from Monte Carlo simulations are discussed.

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