This study combines 8 years of middle atmospheric wind data observed at 52°N latitude from two radars in different longitudinal sectors to investigate solar tides. The power spectral density of horizontal winds exhibits a −3 power law within the frequency range 2.0 < f < 7.0 cpd (equivalent to periods 3.6 − 12.0 hr). Particularly noteworthy are the 4.8- and 4-hr tides, exhibiting signal-to-noise ratios ranging between 13 and 16 dB, surpassing the 0.01 significance level. This challenges their previous oversight in literature, possibly due to inadequacies in prevailing noise models. Cross-spectra between longitudinal sectors emphasize the dominance of sun-synchronous components in the six lowest-frequency tides. Composite spectra indicate that tidal enhancements during SSWs resemble regular seasonal variations. Intriguingly, year-to-year spectral variations suggest that these enhancements are more influenced by seasonal dynamics than by SSW, contrasting with established literature. These findings underscore the need to reevaluate tidal harmonics and consider appropriate noise models in future studies.

中文翻译：

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地球大气中高阶太阳潮汐谐波的观测验证

这项研究结合了不同纵向扇区的两台雷达在北纬 52°观测到的 8 年中层大气风数据来研究太阳潮。水平风的功率谱密度在频率范围 2.0 < f  < 7.0 cpd（相当于周期 3.6 − 12.0 hr）内表现出 −3 幂律 。特别值得注意的是 4.8 小时和 4 小时的潮汐，其信噪比在 13 至 16 dB 之间，超过了 0.01 的显着性水平。这对他们之前在文献中的监督提出了挑战，可能是由于流行的噪声模型的不足。纵向扇区之间的交叉光谱强调了太阳同步分量在六个最低频率潮汐中的主导地位。复合光谱表明，SSW 期间的潮汐增强类似于常规的季节变化。有趣的是，与现有文献相比，逐年的光谱变化表明这些增强更多地受到季节性动态的影响，而不是 SSW 的影响。这些发现强调需要重新评估潮汐谐波并在未来的研究中考虑适当的噪声模型。