Troposphere-Ionosphere Coupling via Atmospheric Gravity Waves

在我们的分层大气中，重力（或内部）波是准周期性扰动，最熟悉的是波浪状的云模式，例如在山脉的背风处观察到的。 该项目旨在通过实验研究大气重力波在电离层-对流层耦合中的作用。特别是，将研究电离层F区等离子体密度不规则性的动力学，以及这些不规则性与大气重力波的联系。调查将在南极洲进行，因为：1）那里可能观察到大量的重力波，2）那里的电磁背景是安静的，对本研究中观察到的无线电信号的检测很重要。为了探测密度的不规则性，将在南极洲的两个不同地点放置一个高频接收器和发射器，沿这两点之间的通道沿着探测电离层。将使用数值模拟来描述高频信号电离层路径以下对流层的参数。高频信号将提供有关密度不规则性的信息，数值模型将提供有关对流层重力波的信息。通过比较数值模型和高频观测的信息，研究人员将能够得出关于电离层等离子体和重力波中同时出现不规则性的结论。

In our layered atmosphere, gravity (or internal) waves are quasi-periodic disturbances most familiar as the wave-like cloud patterns, such as observed in the lee of mountain ranges. This project seeks to experimentally investigate the role of the atmospheric gravity waves in ionosphere-troposphere coupling. In particular, the dynamics of plasma density irregularities in the ionospheric F region, and the connection of these irregularities with atmospheric gravity waves will be investigated. The investigation is to take place in Antarctica as: 1) Large numbers of gravity waves may be observed there, and 2) The electromagnetic background there is quiet, important for detection of radio signals to be observed in this study. To detect the density irregularities a HF receiver and transmitter will be placed at two different locations in Antarctica, probing the ionosphere along the passage between these two points. Numerical modelling will be used to describe parameters of the troposphere below the ionospheric path of the HF signal. The HF signal will give information about density irregularities, and the numerical model will give information about gravity waves in the troposphere. By comparing information of numerical model and from HF observations the investigators will be able to make conclusions about simultaneous occurrences of irregularities in the ionospheric plasma and gravity waves.