Pumping out the atmosphere of Mars through solar wind pressure pulses
Pumping out the atmosphere of Mars through solar wind pressure pulses
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DOI：
10.1029/2009gl041814
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发表时间：
2010-02
影响因子：
5.2
通讯作者：
N. Edberg;Hans Nilsson;A. O. Williams;Mark Lester;S. Milan;S. Cowley;M. Fränz;S. Barabash;Y. Futaana
中科院分区：
文献类型：
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作者：
N. Edberg;Hans Nilsson;A. O. Williams;Mark Lester;S. Milan;S. Cowley;M. Fränz;S. Barabash;Y. Futaana
我们研究火星大气逃逸太阳风压力脉冲。在2007-08年的太阳极小期，我们观察到41个高压事件，其中主要是确定为共转相互作用区（CIR），而一些是日冕物质抛射（CME），在数据中从高级成分探测器（ACE）的地球上游。其中36个事件也是使用火星快车（MEX）在火星上的数据确定的。我们使用MEX测量在火星上的重行星离子的antisunward通量在安静的太阳风条件下的通量，这些脉冲的通道进行比较。观察到离子通量平均增加了2.5倍。因此，火星总流出量的三分之一发生在太阳风压力脉冲影响火星的时间的0.15%。这可能对火星等离子体流出的总时间积分产生重要影响。
We study atmospheric escape from Mars during solar wind pressure pulses. During the solar minimum of 2007–08 we have observed 41 high pressure events, which are predominantly identified as corotating interaction regions (CIR) while a few are coronal mass ejections (CME), in data from the Advanced Composition Explorer (ACE) upstream of the Earth. 36 of these events are also identified using Mars Express (MEX) data at Mars. We use MEX measurements at Mars to compare the antisunward fluxes of heavy planetary ions during the passage of these pulses to the fluxes during quiet solar wind conditions. The ion fluxes are observed to increase by a factor of ∼2.5, on average. Hence, a third of the total outflow from Mars takes place during ∼15% of the time, when a solar wind pressure pulse impacts on the planet. This can have important consequences for the total time‐integrated outflow of plasma from Mars.