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Title:
Helium escape from the terrestrial atmosphere: The ion outflow mechanism
Authors:
Lie-Svendsen, Ø.; Rees, M. H.
Publication:
Journal of Geophysical Research, Volume 101, Issue A2, p. 2435-2444 (JGR Homepage)
Publication Date:
02/1996
Origin:
AGU
Keywords:
Ionosphere: Polar cap ionosphere, Ionosphere: Ionosphere/magnetosphere interactions, Atmospheric Composition and Structure: Evolution of the atmosphere
DOI:
10.1029/95JA02208
Bibliographic Code:
1996JGR...101.2435L

Abstract

We have computed global He+ escape fluxes for a range and a variety of diurnal, seasonal, universal time, and solar activity geophysical conditions. We average over the short-term variables and compute the globally averaged escape flux for a range of cutoff latitudes, which separate regions of open and closed field lines, during one solar cycle. The global escape flux averaged over a solar cycle was computed, and we find that a cutoff latitude of about 60° or lower is sufficient to balance the outgassing from the Earth's crust.
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Database: Astronomy
Physics
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