Horizontal phase speeds for a medium‐scale traveling ionospheric disturbance (TID) are calculated from three different atmospheric gravity wave (AGW) dispersion relations using vertical phase speeds derived from vertical ionograms measured by a single ionosonde. Observed heights from a network of four ionosondes in southern New Mexico provide the measured phase velocities. Horizontal phase speeds calculated from the dispersion relations are compared to measured TID speeds as a function of altitude and show general agreement. However, the linear relationship between the vertical and calculated horizontal AGW speeds for this TID frequency and wavenumber range predicts larger variations than the observations. The inclusion of viscosity and thermal diffusion terms in the dispersion relations increases the agreement with measurements. This technique provides a new method of predicting horizontal TID phase speeds from measurements at a single ionosonde site.

中文翻译：

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从Digisonde单站点垂直电离图估计行进的电离层扰动的水平相速度

利用三个不同的大气重力波（AGW）色散关系，使用从单个离子探空仪测得的垂直电离图得出的垂直相速度，计算出中等规模电离层扰动（TID）的水平相速度。从新墨西哥州南部的四个离子探空仪网络观测到的高度提供了测得的相速度。根据色散关系计算出的水平相速度与测得的TID速度随高度的变化进行比较，并显示出基本的一致性。但是，对于此TID频率和波数范围，垂直和计算的水平AGW速度之间的线性关系预测的变化要大于观测值。色散关系中包含粘度和热扩散项会增加与测量的一致性。