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Enhanced O-2(+) los...
Enhanced O-2(+) loss at Mars due to an ambipolar electric field from electron heating
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- Ergun, R. E. (author)
- Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA.;Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80309 USA.
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- Andersson, L. A. (author)
- Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80309 USA.
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- Fowler, C. M. (author)
- Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA.;Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80309 USA.
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- Woodson, A. K. (author)
- Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80309 USA.
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- Weber, T. D. (author)
- Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80309 USA.
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- Delory, G. T. (author)
- Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA.
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- Andrews, David J. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Eriksson, Anders I. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- McEnulty, T. (author)
- Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80309 USA.
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- Morooka, M. W. (author)
- Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80309 USA.
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- Stewart, A. I. F. (author)
- Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80309 USA.
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- Mahaffy, P. R. (author)
- NASA, Goddard Space Flight Ctr, Planetary Environm Lab, Code 699, Greenbelt, MD USA.
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- Jakosky, B. M. (author)
- Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80309 USA.
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Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA;Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80309 USA. Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80309 USA. (creator_code:org_t)
- 2016
- 2016
- English.
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In: Journal of Geophysical Research - Space Physics. - 2169-9380 .- 2169-9402. ; 121:5, s. 4668-4678
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- Recent results from the MAVEN Langmuir Probe and Waves instrument suggest higher than predicted electron temperatures (T-e) in Mars' dayside ionosphere above similar to 180km in altitude. Correspondingly, measurements from Neutral Gas and Ion Mass Spectrometer indicate significant abundances of O-2(+) up to similar to 500km in altitude, suggesting that O-2(+) may be a principal ion loss mechanism of oxygen. In this article, we investigate the effects of the higher T-e (which results from electron heating) and ion heating on ion outflow and loss. Numerical solutions show that plasma processes including ion heating and higher T-e may greatly increase O-2(+) loss at Mars. In particular, enhanced T-e in Mars' ionosphere just above the exobase creates a substantial ambipolar electric field with a potential (e) of several k(B)T(e), which draws ions out of the region allowing for enhanced escape. With active solar wind, electron, and ion heating, direct O-2(+) loss could match or exceed loss via dissociative recombination of O-2(+). These results suggest that direct loss of O-2(+) may have played a significant role in the loss of oxygen at Mars over time.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- ion escape
- ambipolar electric field
- Mars atmospheric loss
- O-2(+) loss at Mars
- Mars ionosphere
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Ergun, R. E.
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Andersson, L. A.
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Fowler, C. M.
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Woodson, A. K.
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Weber, T. D.
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Delory, G. T.
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Andrews, David J ...
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Eriksson, Anders ...
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McEnulty, T.
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Morooka, M. W.
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Stewart, A. I. F ...
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Mahaffy, P. R.
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Jakosky, B. M.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Journal of Geoph ...
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Uppsala University