文章基本信息

标题：New density estimates derived using accelerometers on board the CHAMP and GRACE satellites
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作者：Piyush M. Mehta ; Andrew C. Walker ; Eric K. Sutton 等
期刊名称：Space Weather
印刷版ISSN：1542-7390
出版年度：2017
卷号：15
期号：4
页码：558-576
DOI：10.1002/2016SW001562
语种：English
出版社：American Geophysical Union
摘要：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.