Global characteristics of gravity waves in the upper atmosphere of Mars as measured by MAVEN/NGIMS
Global characteristics of gravity waves in the upper atmosphere of Mars as measured by MAVEN/NGIMS
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DOI：
10.1016/j.icarus.2019.05.021
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发表时间：
2018-09
期刊：
影响因子：
3.2
通讯作者：
Alex Siddle-;I. Mueller-Wodarg;S. Stone;R. Yelle
中科院分区：
文献类型：
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作者：
Alex Siddle-;I. Mueller-Wodarg;S. Stone;R. Yelle
我们提出了一个重力波在火星的高层大气120公里以上的分析。利用MAVEN上NGIMS的现场数据，我们已经能够从近4000个轨道上收集电波。我们已经使用温度和密度剖面来提取扰动，并将其解释为垂直传播的重力波，我们通过它们的振幅和波长来表征。在这一区域的大气中，重力波的振幅约为10%。垂直波长约为10-30公里。我们观察到重力波振幅随太阳天顶角的增加而增加。重力波振幅在昼侧随高度变化不明显，而在夜侧随高度增加。
We present an analysis of gravity waves in Mars' upper atmosphere above 120 km. Using in-situ data from NGIMS onboard MAVEN we have been able to characterise waves from nearly 4000 orbits. We have used temperature and density profiles to extract perturbations and interpret these as vertically propagating gravity waves which we characterise by their amplitude and wavelength. In this region of the atmosphere gravity waves have amplitudes of around 10%. Vertical wavelengths are found to be around 10–30 km. We observe an increase in gravity wave amplitudes with increasing solar zenith angle. Gravity wave amplitudes appear invariant in altitude on the dayside, however increase with altitude on the nightside.