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  The Relationship Between Photoelectron Boundary and Steep Electron Density Gradient on Mars: MAVEN Observations

Han, Q., Fan, K., Cui, J., Wei, Y., Fränz, M., Dubinin, E. M., et al. (2019). The Relationship Between Photoelectron Boundary and Steep Electron Density Gradient on Mars: MAVEN Observations. Journal of Geophysical Research: Space Physics, 124(10), 8015-8022. doi:10.1029/2019JA026739.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-86A6-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-86A7-7
Genre: Journal Article

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 Creators:
Han, Qianqian, Author
Fan, Kai1, Author
Cui, Jun, Author
Wei, Yong, Author
Fränz, Markus2, Author              
Dubinin, E. M.2, Author              
Chai, Lihui, Author
Rong, Zhaojin, Author
Wan, Weixing, Author
Andersson, Laila, Author
Mitchell, David L., Author
Connerney, J.E.P., Author
Affiliations:
1Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_1125546              
2Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 Abstract: The Martian ionopause is generally identified as a steep electron density gradient and the peak of photoelectrons near 27 eV. However, it is not clear whether these two criteria identify the same position in the Martian ionopause region. The Mars Atmosphere and Volatile Evolution Mission (MAVEN) provides a good chance to compare both criteria for the first time with electron density data taken from the Langmuir probe and electron energy spectra from the Solar Wind Electron Analyzer. We identified 1,121 steep electron density gradients and 4,275 photoelectron boundary crossings within the first 2.7 years of MAVEN data. Observations show that two boundaries are nearly collocated when being observed simultaneously (about 15% of the available dataset). But when averaged over all observations, the photoelectron boundary locates higher than the steep electron density gradient. This may suggest a strong dependency of the Martian ionopause on magnetic field configuration in the Martian ionosphere. Results are generally consistent with previous observations made by Mars Express (MEX) and improve our understanding of the Martian ionosphere.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1029/2019JA026739
ADS: 2019JGRA..124.8015H
 Degree: -

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Title: Journal of Geophysical Research: Space Physics
  Other : JGR-A
  Abbreviation : J. Geophys. Res. - A
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Geophysical Union
Pages: - Volume / Issue: 124 (10) Sequence Number: - Start / End Page: 8015 - 8022 Identifier: ISSN: 0148-0227
CoNE: https://pure.mpg.de/cone/journals/resource/991042728714264