Seasonal variability of Martian ion escape through the plume and tail from MAVEN observations

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  • Y. Dong
    Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder Colorado USA
  • X. Fang
    Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder Colorado USA
  • D. A. Brain
    Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder Colorado USA
  • J. P. McFadden
    Space Science Laboratory University of California Berkeley California USA
  • J. S. Halekas
    Department of Physics and Astronomy University of Iowa Iowa City Iowa USA
  • J. E. P. Connerney
    Goddard Space Flight Center NASA Greenbelt Maryland USA
  • F. Eparvier
    Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder Colorado USA
  • L. Andersson
    Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder Colorado USA
  • D. Mitchell
    Space Science Laboratory University of California Berkeley California USA
  • B. M. Jakosky
    Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder Colorado USA

書誌事項

公開日
2017-04
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2016ja023517
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>We study the Mars Atmosphere and Volatile Evolution spacecraft observations of Martian planetary ion escape during two time periods: 11 November 2014 to 19 March 2015 and 4 June 2015 to 24 October 2015, with the focus on understanding the seasonal variability of Martian ion escape in response to the solar extreme ultraviolet (EUV) flux. We organize the >6 eV O<jats:sup>+</jats:sup> ion data by the upstream electric field direction to estimate the escape rates through the plume and tail. To investigate the ion escape dependence on the solar EUV flux, we constrain the solar wind dynamic pressure and interplanetary magnetic filed strength and compare the ion escape rates through the plume and tail in different energy ranges under high and low EUV conditions. We found that the total >6 eV O<jats:sup>+</jats:sup> escape rate increases from 2 to 3 × 10<jats:sup>24</jats:sup> s<jats:sup>−1</jats:sup> as the EUV irradiance increases by almost the same factor, mostly on the <1 keV tailward escape. The plume escape rate does not vary significantly with EUV. The relative contribution from the plume to the total escape varies between ~30% and ~20% from low to high EUV. Our results suggest that the Martian ion escape is sensitive to the seasonal EUV variation, and the contribution from plume escape becomes more important under low EUV conditions.</jats:p>

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