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首页> 外文OA文献 >Comparative study of the Martian suprathermal electron depletions based on Mars Global Surveyor, Mars Express and Mars Atmosphere and Volatile EvolutioN missions observations
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Comparative study of the Martian suprathermal electron depletions based on Mars Global Surveyor, Mars Express and Mars Atmosphere and Volatile EvolutioN missions observations

机译：基于火星全球探测器，火星快车和火星大气层以及挥发性进化观测资料的火星超热电子耗竭的对比研究

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Nightside suprathermal electron depletions have been observed at Mars by three spacecraft to date: Mars Global Surveyor, Mars Express, and the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission. This spatial and temporal diversity of measurements allows us to propose here a comprehensive view of the Martian electron depletions through the first multispacecraft study of the phenomenon. We have analyzed data recorded by the three spacecraft from 1999 to 2015 in order to better understand the distribution of the electron depletions and their creation mechanisms. Three simple criteria adapted to each mission have been implemented to identify more than 134,500 electron depletions observed between 125 and 900 km altitude. The geographical distribution maps of the electron depletions detected by the three spacecraft confirm the strong link existing between electron depletions and crustal magnetic field at altitudes greater than ~170 km. At these altitudes, the distribution of electron depletions is strongly different in the two hemispheres, with a far greater chance to observe an electron depletion in the Southern Hemisphere, where the strongest crustal magnetic sources are located. However, the unique MAVEN observations reveal that below a transition region near 160–170 km altitude the distribution of electron depletions is the same in both hemispheres, with no particular dependence on crustal magnetic fields. This result supports the suggestion made by previous studies that these low-altitudes events are produced through electron absorption by atmospheric CO2.
机译：迄今为止，迄今已有三艘航天器在火星上观测到了夜间的超热电子耗竭：火星全球测量师，火星快车号和火星大气与挥发性演化（MAVEN）任务。测量的这种时空多样性使我们能够通过对这种现象的首次多宇宙飞船研究，在此提出火星电子耗尽的全面视图。为了更好地了解电子耗尽的分布及其产生机理，我们分析了这三颗航天器1999年至2015年记录的数据。已经实施了三个适用于每个任务的简单标准，以识别在125至900公里的高度之间观察到的134,500多个电子损耗。这三架航天器探测到的电子损耗的地理分布图证实了在海拔大于170千米的情况下，电子损耗与地壳磁场之间存在牢固的联系。在这些高度上，两个半球的电子损耗分布有很大差异，在地壳磁场最强的南半球观测到电子损耗的机会要大得多。然而，MAVEN的独特观测表明，在海拔160-170 km附近的过渡区域以下，两个半球的电子损耗分布相同，而对地壳磁场没有特别的依赖性。这一结果支持了先前研究的建议，即这些低空事件是通过大气CO2吸收电子而产生的。

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