Abstract

Based on the spectral observations of Jupiter carried out over recent years, we consider the behavior of weak molecular absorption bands of methane and ammonia in a wavelength range of 600−800 nm. In the latitudinal behavior of the intensity of these bands, rather clearly expressed features, demonstrating a connection with the zonal structure of cloud belts of the planet, are traced. However, for different bands, the positions of the absorption extrema in latitude somewhat differ. The changes in the zonal spectra show the weakening in absorption observed toward the disk edge, which is most probably connected with the radiative transfer geometry in an optically active layer of the atmosphere. The importance of studying the weak absorption bands is stressed, since precisely these bands make it possible to analyze the structural features and their variations in the troposphere of Jupiter. When interpreting the observational data, it is necessary to consider at least two alternative models for forming the absorption bands. One of them should deal with an optically thick layer of ammonia clouds, where the multiple scattering on particles in this layer plays the main part in producing the molecular absorption bands. The second model should be based on the assumption of a small optical thickness of the ammonia cloud layer, according to which the absorption is mainly formed under clouds, where the scattering on a pure gaseous component is weak.

中文翻译：

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木星上弱分子吸收带行为的区带特征

摘要

根据近年来对木星的光谱观察，我们考虑了在600-800 nm波长范围内甲烷和氨的弱分子吸收带的行为。在这些带的强度的纬度行为中，可以追溯到相当清楚表达的特征，这些特征表明与行星云带的带状结构有关。但是，对于不同的频带，吸收极值在纬度上的位置有些不同。纬向光谱的变化表明，向圆盘边缘观察到的吸收减弱，这很可能与大气的光学活性层中的辐射传输几何形状有关。强调研究弱吸收带的重要性，因为正是这些频带使分析木星对流层的结构特征及其变化​​成为可能。在解释观测数据时，有必要考虑至少两个形成吸收带的替代模型。其中之一应处理光学上较厚的氨云层，其中该层中粒子上的多次散射是产生分子吸收带的主要部分。第二个模型应基于氨云层的光学厚度较小的假设，据此，吸收主要是在云层下形成的，其中在纯气态成分上的散射较弱。有必要考虑至少两个替代模型来形成吸收带。其中之一应处理光学上较厚的氨云层，其中该层中粒子上的多次散射是产生分子吸收带的主要部分。第二个模型应基于氨气云层的光学厚度较小的假设，据此，吸收主要是在云层下形成的，在云层中，纯气体成分的散射较弱。有必要考虑至少两个替代模型来形成吸收带。其中之一应处理光学上较厚的氨云层，该层中粒子上的多次散射是产生分子吸收带的主要部分。第二个模型应基于氨气云层的光学厚度较小的假设，据此，吸收主要是在云层下形成的，在云层中，纯气体成分的散射较弱。