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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Ionospheric response to tidal waves measured by dynasonde techniques
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Ionospheric response to tidal waves measured by dynasonde techniques

机译：潮汐波电离层响应测量dynasonde技术

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摘要

Atmospheric tides are known to have a dramatic influence on thermospheric and ionospheric structure and variability. Considerable effort goes into understanding characteristics of tidal modes, their interactions with planetary and gravity waves and other tidal modes, as well as their influence on the background state of the thermosphere-ionosphere system. For the altitude interval between roughly 120 and 400 km, this effort is somewhat hindered by the lack of global observations. We propose a new method of determining tidal variability by making use of dynasonde measurements. The NeXtYZ inversion procedure produces altitude profiles of the ionospheric parameters with a vertical resolution typically better than 1 km. This, together with the typical 2 min cadence of the instrument, results in extensive data sets with wide temporal and altitude coverage. At any given altitude we have nonuniform sampling due to the natural ionospheric variability. A Lomb-Scargle implementation is used to obtain equivalent results at all altitudes and locations. We report height profiles of the first three tidal harmonics derived from dynasonde measurements. The data analyzed include the vertical electron density profiles, the ionospheric X (east-west) "tilt" measurement, and the derived zonal plasma density gradient. Both the tilt and the gradient are shown to be sensitive tracers of atmospheric waves. We use data from Wallops Island and San Juan, for two time intervals: 6 May-6 June and 9 October-8 November 2013, thus capturing seasonal, latitudinal, and altitude variations of tidal amplitude and phase. This proves the potential of using dynasonde-capable instruments as a data source for tidal studies in the thermosphere.
机译：大气潮汐已知有一个戏剧性的对thermospheric和电离层的影响结构和可变性。进入了解潮汐的特性模式,与行星和他们交互重力波和其他潮汐模式,以及对的背景状态的影响thermosphere-ionosphere系统。间隔约120至400公里,这个缺乏全球努力有些阻碍观察。确定利用潮汐变化dynasonde测量。过程产生高度的概要文件电离层参数的垂直分辨率通常比1公里。典型的2分钟节奏的乐器,结果与宽时间广泛的数据集和高度覆盖。非均匀采样由于自然吗电离层的变化。实现用于获得相同结果高度和位置。高度的前三潮来自dynasonde谐波测量。数据分析包括垂直电子密度资料、电离层X(东西)“倾斜”测量,派生的纬向等离子体密度梯度。证明是敏感的踪迹,大气波。胡安,两个时间间隔:6 5月6日和6月9日10月8日2013年11月,从而捕捉季节,纬度、海拔的潮汐变化振幅和相位。使用dynasonde-capable仪器作为数据源潮研究热大气层。

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