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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Seasonal Variation of O/N_2 on Different Pressure Levels From GUVI Limb Measurements
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Seasonal Variation of O/N_2 on Different Pressure Levels From GUVI Limb Measurements

机译：季节性变化的O /甲烷在不同的压力从GUVI肢体测量水平

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摘要

The ratio of O number density to N_2 number density (O/N_2) is an important parameter to describe thermospheric composition changes and its effects on the ionosphere. Based on Global Ultraviolet Imager (GUVI) limb measurements, we investigate the seasonal behaviors of O/N_2 volume density ratio on different constant pressure levels during geomagnetically quiet periods. The global O/N_2 shows the prominent annual and semiannual variations with solar activity dependence. An empirical model considering the solar activity and annual/semiannual variations can reasonably reproduce the original O/N_2. The modeled O/N_2 captures the hemispheric asymmetry of the annual variations in both length and magnitude. Global maps of the seasonal harmonic components of the modeled O/N_2 indicate the latitudinal and altitudinal dependence of O/N_2 seasonal variations. The annual component dominates over the semiannual component at mid-latitudes, but it is smaller than the semiannual component at low latitudes. In the Northern Hemisphere, and at low geomagnetic latitudes of the Southern Hemisphere, the annual component peaks around December solstice at all altitudes, whereas at middle geomagnetic latitudes of the Southern Hemisphere, it peaks around June solstice. The semiannual component peaks at the equinoxes in almost all regions over the globe at all altitudes. The annual and semiannual amplitudes both increase with altitude. In addition, O/N_2 annual variations and solar activity dependence are more influenced by the thermal expansion and contraction.
机译：O数密度比甲烷、号码密度(O /甲烷)是一个重要的参数描述thermospheric组成和变化对电离层的影响。紫外成像仪(GUVI)肢体测量,我们O /甲烷的季节性行为进行调查体积密度比率在不同的常数在眼睛安静的压力水平期。与太阳能半年度和年度变化活动的依赖。考虑到太阳活动年度/半年可以合理地变化复制原始的O /甲烷。抓住了半球不对称的年度长度和大小的变化。地图的季节性的谐波成分O /甲烷表示纬度和建模高度的依赖性的O /甲烷、季节性的变化。半年一次的组件在中纬度地区,但它小于半年组件在低吗纬度。地磁纬度的南半球,每年的12月组件周围的山峰冬至的高度,而在中间地磁纬度的南半球,它的峰值在夏至。春分和秋分在几乎所有组件的山峰海拔地区在世界各地。年度和半年度振幅增加与高度。变化和太阳活动更加的依赖热膨胀的影响收缩。

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