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  Reduced Atmospheric Ion Escape Above Martian Crustal Magnetic Fields

Fan, K., Fränz, M., Wei, Y., Han, Q., Dubinin, E. M., Cui, J., et al. (2019). Reduced Atmospheric Ion Escape Above Martian Crustal Magnetic Fields. Geophysical Research Letters, (21), 11764-11772. doi:10.1029/2019GL084729.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-8667-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-86ED-9
Genre: Journal Article

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 Creators:
Fan, Kai1, Author              
Fränz, Markus1, Author              
Wei, Yong, Author
Han, Qianqian, Author
Dubinin, E. M.1, Author              
Cui, Jun, Author
Chai, Lihui, Author
Rong, Zhaojin, Author
Zhong, Jun, Author
Wan, Weixing, Author
Mcfadden, James, Author
Connerney, J.E.P., Author
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 Abstract: Martian crustal fields were considered as too weak to have a distinctive effect on global escape rates of Martian heavy ions. However, new observations by the Mars Atmosphere and Volatile Evolution mission reveal a more precise result and show a notably lower atmospheric ion escape region above the area of the strongest crustal fields. A comparison between the fluxes of high and low energy O+ ions suggests that the strongest crustal fields may trap low energy ions and reduce the solar wind pick‐up efficiency while high energy ions form a flux depletion above the crustal field. Statistical results indicate a maximum reduction of the global escape flux by nearly 35% when the strongest crustal field region is oriented sunward. This is the first time that the protective effect of the crustal fields on heavy planetary ions has been observed and it might indicate a more effective protection of atmospheres by stronger magnetic fields like at Earth.

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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: 10.1029/2019GL084729
ADS: 2019GeoRL..4611764F
 Degree: -

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Title: Geophysical Research Letters
  Abbreviation : GRL
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Geophysical Union / Wiley
Pages: 46 Volume / Issue: (21) Sequence Number: - Start / End Page: 11764 - 11772 Identifier: ISSN: 0094-8276
CoNE: https://pure.mpg.de/cone/journals/resource/954925465217