The characteristics of gravity wave packets in the Venusian atmosphere were studied using high-vertical-resolution temperature profiles obtained by ESA's Venus Express and JAXA's Akatsuki radio occultation experiments with radio holographic methods. Localized disturbances were detected by applying a wavelet transform to the temperature profiles. The packet lengths were found to be distributed over 0.6–10 km, in which typically 1.5–4.0 oscillations are included. The number of oscillations per wave packet was found to have only a slight dependence on the wavelength, which is consistent with the −3 power law dependence of the spectral density on the wavenumber in the saturation model. The spectral densities of the wave packets are roughly aligned with the power law of the saturation model, while the saturation ratio for each quasi-monochromatic wave is low. This suggests that the saturated spectrum is produced by the superposition of individually unsaturated quasi-monochromatic waves. Waves with short vertical wavelengths (<1.5 km) were found to be more prevalent at lower altitudes than at higher altitudes, implying an effect of radiative damping during upward propagation. The amplitude was found to be larger at higher latitudes, which might be attributed to an increase in background static stability at high latitudes, which allows larger saturation amplitudes.

中文翻译：

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无线电掩星实验观测到的金星大气中的引力波包：与饱和理论的比较

使用由欧空局的金星快车和日本宇宙航空研究开发机构的 Akatsuki 无线电掩星实验获得的高垂直分辨率温度剖面，利用射电全息方法研究了金星大气中重力波包的特征。通过对温度曲线应用小波变换来检测局部扰动。发现数据包长度分布在 0.6-10 公里范围内，其中通常包括 1.5-4.0 次振荡。发现每个波包的振荡次数仅对波长有轻微的依赖性，这与饱和模型中光谱密度对波数的 -3 幂律依赖性一致。波包的频谱密度与饱和模型的幂律大致对齐，而每个准单色波的饱和度较低。这表明饱和光谱是由单个不饱和准单色波的叠加产生的。发现垂直波长较短（<1.5 公里）的波在低海拔地区比在高海拔地区更为普遍，这意味着在向上传播过程中存在辐射阻尼效应。发现高纬度地区的振幅更大，这可能归因于高纬度地区背景静态稳定性的增加，这允许更大的饱和振幅。意味着向上传播过程中的辐射阻尼效应。发现高纬度地区的振幅更大，这可能归因于高纬度地区背景静态稳定性的增加，这允许更大的饱和振幅。暗示向上传播过程中的辐射阻尼效应。发现高纬度地区的振幅更大，这可能归因于高纬度地区背景静态稳定性的增加，这允许更大的饱和振幅。