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New density estimates derived using accelerometers on board the CHAMP and GRACE satellites

机译：使用CHAMP和GRACE卫星上的加速度计得出的新密度估算值

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Atmospheric mass density estimates derived from accelerometers onboard satellites such as CHAllenging Minisatellite Payload (CHAMP) and Gravity Recovery and Climate Experiment (GRACE) are crucial in gaining insight into open science questions about the dynamic coupling between space weather events and the upper atmosphere. Recent advances in physics-based satellite drag coefficient modeling allow derivation of new density data sets. This paper uses physics-based satellite drag coefficient models for CHAMP and GRACE to derive new estimates for the neutral atmospheric density. Results show an average difference of 14–18% for CHAMP and 10–24% for GRACE between the new and existing data sets depending on the space weather conditions (i.e., solar and geomagnetic activity levels). The newly derived densities are also compared with existing models, and results are presented. These densities are expected to be useful to the wider scientific community for validating the development of physics-based models and helping to answer open scientific questions regarding our understanding of upper atmosphere dynamics such as the sensitivity of temporal and global density variations to solar and geomagnetic forcing.
机译：从诸如挑战挑战型微型卫星有效载荷（CHAMP）和重力恢复与气候实验（GRACE）等卫星上的加速度计得出的大气质量密度估计值，对于深入了解有关空间天气事件与高层大气之间动态耦合的开放科学问题至关重要。基于物理学的卫星阻力系数建模的最新进展允许导出新的密度数据集。本文将基于物理的卫星阻力系数模型用于CHAMP和GRACE，以得出中性大气密度的新估计值。结果表明，根据空间天气条件（即太阳和地磁活动水平），新数据集和现有数据集之间CHAMP的平均差异为14-18％，GRACE的平均差异为10-24％。还将新导出的密度与现有模型进行比较，并给出结果。这些密度有望对更广泛的科学界有用，以验证基于物理学的模型的发展，并有助于回答有关我们对高层大气动力学理解的开放性科学问题，例如时间和全球密度变化对太阳和地磁强迫的敏感性。 。

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