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Helium escape from the terrestrial atmosphere: The ion outflow mechanism
Norwegian Defence Research Establishment, Kjeller, Norway
Geophysical Institute, University of Alaska, Fairbanks
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.
Received 22 September 1994; accepted 17 July 1995; .
Citation: (1996), Helium escape from the terrestrial atmosphere: The ion outflow mechanism, J. Geophys. Res., 101(A2), 2435–2443.
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