On Atmospheric Loss of Oxygen Ions from Earth Through Magnetospheric Processes

Details On Atmospheric Loss of Oxygen Ions from Earth Through Magnetospheric Processes On Atmospheric Loss of Oxygen Ions from Earth Through Magnetospheric Processes

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001sci...291.1939s&link_type=abstract

Science, Volume 291, Issue 5510, pp. 1939-1941 (2001).

Physics

30

Scientific paper

In Earth's environment, the observed polar outflow rate for O+ ions, the main source of oxygen above gravitational escape energy, corresponds to the loss of ~18% of the present-day atmospheric oxygen over 3 billion years. However, part of this apparent loss can actually be returned to the atmosphere. Examining loss rates of four escape routes with high-altitude spacecraft observations, we show that the total oxygen loss rate inferred from current knowledge is about one order of magnitude smaller than the polar O+ outflow rate. This disagreement suggests that there may be a substantial return flux from the magnetosphere to the low-latitude ionosphere. Then the net oxygen loss over 3 billion years drops to ~2% of the current atmospheric oxygen content.

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