Wind-enhanced escape with application to terrestrial helium

Details Wind-enhanced escape with application to terrestrial helium Wind-enhanced escape with application to terrestrial helium

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.1207h&link_type=abstract

Journal of Geophysical Research, vol. 81, Mar. 1, 1976, p. 1207-1212.

Physics

2

Atmospheric Diffusion, Exosphere, Helium, Wind Effects, Earth Atmosphere, Jeans Theory, Polar Regions, Thermosphere

Scientific paper

We derive a simple expression for the escape flux which takes into account horizontal winds at the exobase. The escape flux is shown to increase with the wind velocity and becomes much larger than the Jeans escape flux for velocities approaching the thermal velocity. This model is applied to terrestrial He-4, where we determine the conditions required for wind-enhanced escape to contribute to the overall He-4 budget. For completeness, we also derive an expression for the escape flux when only a vertical wind is present at the exobase.

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