Internal Structure of Venus Based on the PREM Model

IF 0.8 4区物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS Solar System Research Pub Date : 2023-10-02 DOI:10.1134/S0038094623040020

D. O. Amorim, T. V. Gudkova

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Abstract—

Models of the internal structure of Venus have been constructed with a wide range of crustal thickness (30–70 km) and core radius (2800–3500 km). An analysis of the pressure values in the center of the planet allows us to conclude that the presence of a solid inner core is unlikely if the composition and temperature profile of Venus correspond to that of the Earth. Andrade’s rheology was used to take into account the inelasticity of the interior of Venus when calculating the tidal Love numbers and the angle of delay of the tidal hump. Comparison of experimental values of the Love number k₂ with the model gives the radius of the core of Venus in the range of 3100–3500 km. It is shown that to determine the characteristic viscosity of the Venusian mantle, the key factor is the determination of the angle of retardation of the tidal bulge: values of 0.9° correspond to low viscosity and high temperature, and 0.4° to high viscosity and low temperature, so the planned measurements of tidal parameters and the moment of inertia of the planet in the VERITAS and EnVision missions will be able to impose restrictions on the distribution of viscosity and temperature in the interior of Venus.

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基于PREM模型的金星内部结构

摘要——金星内部结构的模型已经建立，地壳厚度（30–70公里）和核心半径（2800–3500公里）范围很广。通过对行星中心压力值的分析，我们可以得出结论，如果金星的成分和温度分布与地球的一致，那么不太可能存在固体内核。安德拉德的流变学在计算潮汐洛夫数和潮峰的延迟角时考虑了金星内部的不弹性。Love数k2的实验值与模型的比较给出了金星核心半径在3100–3500公里范围内的结果。结果表明，要确定金星地幔的特征粘度，关键因素是潮汐隆起的滞后角的确定：0.9°的值对应于低粘度和高温，以及0.4°到高粘度和低温，因此VERITAS和EnVision任务中计划的潮汐参数和行星惯性矩测量将能够对金星内部的粘度和温度分布施加限制。

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来源期刊

Solar System Research 地学天文-天文与天体物理

CiteScore

1.60

自引率

33.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Solar System Research publishes articles concerning the bodies of the Solar System, i.e., planets and their satellites, asteroids, comets, meteoric substances, and cosmic dust. The articles consider physics, dynamics and composition of these bodies, and techniques of their exploration. The journal addresses the problems of comparative planetology, physics of the planetary atmospheres and interiors, cosmochemistry, as well as planetary plasma environment and heliosphere, specifically those related to solar-planetary interactions. Attention is paid to studies of exoplanets and complex problems of the origin and evolution of planetary systems including the solar system, based on the results of astronomical observations, laboratory studies of meteorites, relevant theoretical approaches and mathematical modeling. Alongside with the original results of experimental and theoretical studies, the journal publishes scientific reviews in the field of planetary exploration, and notes on observational results.