Статья

Strong plume fluxes at Mars observed by MAVEN: An important planetary ion escape channel

Y. DongLaboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder Colorado USAXiaohua FangLaboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder Colorado USAD. A. BrainLaboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder Colorado USAJ. P. McFaddenSpace Science Laboratory University of California Berkeley California USAJ. S. HalekasDepartment of Physics and Astronomy University of Iowa Iowa City Iowa USAJ. E. P. ConnerneyGoddard Space Flight Center NASA Greenbelt Maryland USAShannon CurrySpace Science Laboratory University of California Berkeley California USAYuki HaradaSpace Science Laboratory University of California Berkeley California USAJ. G. LuhmannSpace Science Laboratory University of California Berkeley California USAB. M. JakoskyLaboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder Colorado USA

2015en

ABI

Аннотация

Abstract We present observations by the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission of a substantial plume‐like distribution of escaping ions from the Martian atmosphere, organized by the upstream solar wind convection electric field. From a case study of MAVEN particle‐and‐field data during one spacecraft orbit, we identified three escaping planetary ion populations: plume fluxes mainly along the upstream electric field over the north pole region of the Mars‐Sun‐Electric field (MSE) coordinate system, antisunward ion fluxes in the tail region, and much weaker upstream pickup ion fluxes. A statistical study of O + fluxes using 3 month MAVEN data shows that the plume is a constant structure with strong fluxes widely distributed in the MSE northern hemisphere, which constitutes an important planetary ion escape channel. The escape rate through the plume is estimated to be ~30% of the tailward escape and ~23% of the total escape for > 25 eV O + ions.

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Идентификаторы

DOI: 10.1002/2015gl065346

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Цитирований: 2Использованных источников: 0

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