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Dayside electron temperature and density profiles at Mars : First results from the MAVEN Langmuir probe and waves instrument

Ergun, R. E. (author)
Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA.;Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80309 USA.
Morooka, M. W. (author)
Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80309 USA.
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.
Delory, G. T. (author)
Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA.
Andrews, David J. (author)
Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
Eriksson, Anders I. (author)
Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
McEnulty, T. (author)
Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80309 USA.
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)
2015
2015
English.
In: Geophysical Research Letters. - 0094-8276 .- 1944-8007. ; 42:21, s. 8846-8853
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • We present Mars' electron temperature (T-e) and density (n(e)) altitude profiles derived from the MAVEN (Mars Atmosphere and Volatile EvolutioN) mission deep dip orbits in April 2015, as measured by the Langmuir probe instrument. These orbits had periapsides below 130 km in altitude at low solar zenith angles. The periapsides were above the peak in n(e) during this period. Using a Chapman function fit, we find that scale height and projected altitude of the n(e) peak are consistent with models and previous measurements. The peak electron density is slightly higher than earlier works. For the first time, we present in situ measurements of T-e altitude profiles in Mars' dayside in the altitude range from similar to 130 km to 500 km and provide a functional fit. Importantly, T-e rises rapidly with altitude from similar to 180 km to similar to 300 km. These results and functional fit are important for modeling Mars' ionosphere and understanding atmospheric escape.

Subject headings

NATURVETENSKAP  -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)

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