arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2110.09448astro-ph.EPgr-qcphysics.ao-ph
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用无线电掩星实验测量中性大气特性的不确定性廓线的确定

Determination of uncertainty profiles in neutral atmospheric properties measured by radio occultation experiments

Adrien Bourgoin, Edoardo Gramigna, Marco Zannoni, Luis Gomez Casajus, Paolo Tortora

摘要:

无线电掩星通常用于远程评估太阳系内行星或卫星大气的热力学性质。数据处理通常涉及所谓的Abel反演方法或数值射线追踪技术。这两种方法现在都已经很好地建立起来,但是,它们不允许容易地确定大气特性的不确定性分布,这使得结果难以统计解释。最近,一个纯粹的分析方法的基础上的时间传递函数的形式主义提出了无线电掩星数据建模。使用这个公式,我们得到的频率偏移和中性大气的热力学性质,如温度,压力和中性数密度之间的不确定性关系。这些表达式是重要的解释以前的结果从过去的无线电掩星实验。它们对于以严格的方式得出未来任务的系统要求并与大气特性反演的科学要求保持一致特别相关。

英文摘要:

Radio occultations are commonly used to assess remotely the thermodynamic properties of planets or satellites' atmospheres within the solar system. The data processing usually involves the so-called Abel inversion method or the numerical ray-tracing technique. Both these approaches are now well established, however, they do not allow to easily determine the uncertainty profiles in the atmospheric properties, and this makes the results difficult to interpret statistically. Recently, a purely analytical approach based on the time transfer functions formalism was proposed for modeling radio occultation data. Using this formulation, we derive uncertainty relationships between the frequency shift and the thermodynamic properties of the neutral atmosphere such as the temperature, pressure, and neutral number density. These expressions are important for interpreting previous results from past radio occultation experiments. They are especially relevant for deriving the system requirements for future missions in a rigorous manner and consistently with the scientific requirements about the atmospheric properties retrieval.

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