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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Investigation of the Variability of Night-Time Equatorial Thermospheric Winds Over Nigeria, West Africa
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Investigation of the Variability of Night-Time Equatorial Thermospheric Winds Over Nigeria, West Africa

机译：夜间的可变性的调查赤道Thermospheric风在尼日利亚,西方非洲

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摘要

This study examined the variability of the night-time equatorial thermospheric meridional and zonal wind speeds using an optical Fabry-Perot interferometer (FPI) located in Abuja, Nigeria (Geographic: 8.99°N, 7.39°E; Geomagnetic latitude: -1.60). The study period covered 9 months with useable data of 139 nights between March 2016 and January 2018. The hourly zonal wind speed is between -124 and 163 ms~(-1) and that of the meridional wind ranged between -70 and 95 ms~(-1). Comparison of FPI ground-based measurements with estimates from the Horizontal Wind Model (HWM-14) accurately reproduced the post-midnight meridional component, but for some departure of ~50 ms~(-1) during pre-midnight. A very good agreement is observed between the predicted and measured zonal winds speed in the month of January 2018. However, the HWM-14 more often underestimated the zonal wind speeds in the months of 2016. Hence, this necessitates a call for improvement of the HWM-14 by using newly observed data in order to better characterize the West African sector. The varying zonal winds showed modal periods of 25.9 and 133.5 days, which are quasi 27 days and quasiterannual periodic variations, respectively. On the meridional wind, oscillatory periods of 133.5 and 23.1 days are seen in year 2016 and 2017, respectively.
机译：这项研究检查的可变性夜间赤道thermospheric子午使用光学和纬向风速法布里-珀罗干涉仪(FPI)位于尼日利亚阿布贾(地理:8.99°N, 7.39°E;地磁纬度:-1.60)。与可用的数据覆盖了9个月139天2016年3月和2018年1月之间。纬向风速是~女士在-124年和163年之间(1)和经向风之间不等-70年和95年女士~(1)。地面测量的估计水平风模型(HWM-14)准确再现了午夜之后子午组件,但对于一些离职~ 50毫秒~ (1)在pre-midnight。观察和预测之间的测量区域在2018年1月的风的速度。然而,HWM-14往往低估了在2016年的几个月纬向风速。这需要一个呼吁改善通过使用新观测数据以HWM-14更好的描述这个西非部门。不同的纬向风显示25.9模态的时期和133.5天准27天分别quasiterannual周期性变化。经向风,振荡的周期2016年133.5和23.1天2017年,分别。

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