This paper presents a study of diurnal tidal winds observed simultaneously by two meteor radars located on each side of the Equator in the equatorial region. The radars were located in Santa Cruz, Costa Rica (10.3^∘ N, 85.6^∘ W) (hereafter CR) and São João do Cariri, Brazil (7.4^∘ S, 36.5^∘ W) (hereafter CA). The distance between the sites is 5800 km. Harmonic analysis has been used to obtain amplitudes and phases (hour of peak amplitude) for diurnal, semidiurnal and terdiurnal tides between 82 and 98 km altitude, but in this work we concentrate on the diurnal component. The period of observation was from April 2005 to January 2006. The results were compared to the Global Scale Waves Model (GSWM-09). Magnitudes of zonal and meridional amplitudes from November to January for CR were quite different from the predictions of the model. Concerning phases, the agreement between model and radar meridional tidal phases at each site was good, and a vertical wavelength of 24 km for the diurnal tide was observed practically every month, although on some occasions determination of the vertical wavelength was difficult, especially for the zonal component, due to nonlinear phase variations with height. For the diurnal zonal amplitude, there were notable differences between the two sites. We attribute this site-to-site difference of the diurnal zonal amplitude to the nonmigrating component of the tide and propose that an anomaly was present in the troposphere in the winter (Northern Hemisphere) of 2005–2006 which produced substantial longitudinal variation.

中文翻译：

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在哥斯达黎加（10°N，86°W）和巴西（7°S，37°W）的流星雷达同时观测到的日中层潮汐风

本文提出了对位于赤道区域两边的两个流星雷达同时观测到的昼夜潮汐风的研究。雷达位于哥斯达黎加的圣克鲁斯（^北10.3^英寸， 西经85.6^英寸 ）（以下简称华北）和巴西圣若昂杜卡里里（^南7.4^公里 ，36.5^英寸）。 W）（以下称为CA）。站点之间的距离是5800公里。谐波分析已用于获取海拔82至98 km之间的日，半日和三日潮的振幅和相位（峰值振幅小时），但在这项工作中，我们集中于日分量。观察期为2005年4月至2006年1月。将结果与全球尺度波动模型（GSWM-09）进行了比较。CR从11月到1月的纬向和经向振幅大小与模型的预测有很大不同。关于阶段，每个站点的模式潮汐相位和雷达子午潮相位之间的一致性很好，几乎每月都观察到昼夜潮的垂直波长为24 km，尽管在某些情况下很难确定垂直波长，特别是对于区域分量，由于非线性相位随高度的变化而变化。对于昼夜区带振幅，两个位置之间存在显着差异。我们将此日间纬向振幅的站点间差异归因于潮汐的非迁移分量，并提出在2005-2006年冬季（北半球）对流层存在异常，这产生了较大的纵向变化。