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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Enhanced O_2~+ loss at Mars due to an ambipolar electric field from electron heating
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Enhanced O_2~+ loss at Mars due to an ambipolar electric field from electron heating

机译：增强成分~ +损失在火星由于两极电场从电子加热

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摘要

Recent results from the MAVEN Langmuir Probe and Waves instrument suggest higher than predicted electron temperatures (T_e) inMars' dayside ionosphere above ~180km in altitude. Correspondingly, measurements from Neutral Gas and Ion Mass Spectrometer indicate significant abundances of O_2~+ up to ~500km in altitude, suggesting that O_2~+ may be a principal ion loss mechanism of oxygen. In this article, we investigate the effects of the higher T_e (which results from electron heating) and ion heating on ion outflow and loss. Numerical solutions show that plasma processes including ion heating and higher T_e may greatly increase O_2~+ loss at Mars. In particular, enhanced T_e in Mars' ionosphere just above the exobase creates a substantial ambipolar electric field with a potential (eΦ) of several k_BT_e, which draws ions out of the region allowing for enhanced escape.With active solar wind, electron, and ion heating, direct O_2~+ loss couldmatch or exceed loss via dissociative recombination of O_2~+. These results suggest that direct loss of O_2~+ may have played a significant role in the loss of oxygen at Mars over time.
机译：最近从MAVEN朗缪尔探针和结果波建议高于预测工具电子温度(T_e) inmar的光面电离层~海拔180公里以上。相应地,测量从中性的气体和离子质谱计指示意义重大丰度提取成分~ + ~ 500公里的高度,表明成分~ +可能是一个主要离子损失机制的氧气。调查T_e越高(它的影响结果从电子加热)和离子加热离子外流和损失。包括离子加热和等离子体过程高T_e可能大大增加成分~ +损失火星。电离层略高于该范围内创建一个大量的双极性电场与潜在的几个k_BT_e (eΦ),这吸引了离子的地区允许增强逃跑。加热,直接提取成分~ + couldmatch或超过损失通过离解复合成分~ +损失。这些结果表明,提取成分的直接损失~ +可能发挥了重要作用的损失氧气在火星上。

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