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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Evidence of baroclinic waves in the upper atmosphere of Mars using the Mars Global Surveyor accelerometer data
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Evidence of baroclinic waves in the upper atmosphere of Mars using the Mars Global Surveyor accelerometer data

机译：斜压波上的证据火星环球探测者号火星大气中使用加速度计数据

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Here we use accelerometer data of 115 orbits (#P0670–P0789) from 1–30 November 1998, between latitude ranges (50–70°N), and of 57 orbits (#P0588–P0648) from 30 September 1998 to 24 October 1998, between latitude ranges (50–70°N), both under spring equinox and medium solar activity conditions. The neutral densities of different gases are derived from their mixing ratio. From these neutral densities, the longitudinal distribution of total peak ionization rates of CO2 +, N2 +, O2 +, O+, and CO+ are obtained for solar zenith angle 78° because of solar EUV and soft X-ray (1–102.57 nm) radiation using Analytical Yield Spectrum approach. These calculations are made at different altitudes and longitudes starting from 115 to 220 km and from 0 to 360°E using intervals of 0.1 km and 5°, respectively. These conditions are appropriate for Mars Global Surveyor Phase 2 aerobraking period from which the accelerometer data is used. The Fourier analysis is carried out on the calculated total peak ionization rates for different gases both at midlatitude (17–42°N) and high-latitude (50–70°N) range in the upper atmosphere of Mars. This analysis at high latitude indicates the presence of two dominant harmonic regions, in which the first is a class of long planetary-scale waves, associated with the fixed topography of Martian surface, while the second is a class of rapidly moving transient disturbances associated with baroclinic instability processes. The similar analysis carried out at midlatitude (17–42°N) region indicates the absence of second peak at higher wave number, confirming that the baroclinic instability is almost absent at this latitude region.
机译：这里我们使用加速度计数据115年的轨道(# P0670-P0789)从1998年11月,外墙面之间纬度范围(50 - 70°N)和57个轨道(# P0588-P0648)从1998年9月30日到24日1998年10月,在纬度范围(50 - 70°N),在春分和太阳能活动的条件。不同的气体来自他们的混合比率。纵向分布的峰值电离率的CO2 + N2 + O2 + O +,公司+获得了太阳天顶角78°因为太阳能EUV和软x射线(1 - 102.57海里)使用分析产量光谱辐射的方法。不同的纬度和经度从115到220公里,从0到360°E使用间隔分别为0.1公里和5°。火星环球探测者号适合第二阶段吗加速度计的aerobraking时期使用数据。在计算总电离率峰值不同气体在中间纬度(17-42°N)高纬度地区(50 - 70°N)范围上火星大气层。纬度显示两种主要的存在谐波的地区,首先是一个类行星尺度波,长联系在一起火星表面的固定地形第二个是一类快速移动的瞬态干扰与斜压不稳定的过程。在中间纬度(17-42°N)地区表明没有第二个峰值更高斜压波数,确认不稳定在这个纬度几乎缺席地区。

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