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

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 Zusammenfassung: 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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Sprache(n): eng - English
 Datum: 2019
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1029/2019GL084729
ADS: 2019GeoRL..4611764F
 Art des Abschluß: -

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Titel: Geophysical Research Letters
  Kurztitel : GRL
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Washington, D.C. : American Geophysical Union / Wiley
Seiten: 46 Band / Heft: (21) Artikelnummer: - Start- / Endseite: 11764 - 11772 Identifikator: ISSN: 0094-8276
CoNE: https://pure.mpg.de/cone/journals/resource/954925465217