Evaluation of recent atmospheric density models |
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| Institution: | 1. Molecular Cardiology Laboratory, Department of Cardiology, School of Medicine, University of Crete, Heraklion, Greece;2. Department of Cardiology, Heraklion University Hospital, Crete, Greece;1. University of Connecticut School of Medicine, Farmington, Connecticut;2. Connecticut Convergence Institute for Translation in Regenerative Engineering, Farmington, Connecticut;3. University of Connecticut Department of Dermatology, Farmington, Connecticut;1. Qingdao Key Laboratory of Terahertz Technology, College of Electronics, Communication and Physics, Shandong University of Science and Technology, Qingdao 266590, China;2. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China;1. Barcelona Clinic Liver Cancer (BCLC) Group, Liver Unit, Hospital Clinic Barcelona, August Pi i Sunyer Biomedical Research Institute (IDIBAPS), University of Barcelona, Barcelona, Spain;2. Network for Biomedical Research in Hepatic and Digestive Diseases (CIBERehd), Spain |
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| Abstract: | Precision radar tracking data taken in 1985 on two spherical satellites has been used to evaluate atmospheric density models: Jacchia 1971 CIRA 1972], Jacchia 1977, and MSIS 1983, using Cook's definition of Cd /2/. The satellites have perigee heights of 270 km and 780 km. For each day, using numerical integration, an independent trajectory was computed, including a drag scale factor (S). The difference of S from unity represents the error in the atmospheric model used to compute the drag. At 270 km the three models performed equally well, as S was consistently close to unity. This was true for all hour angles and latitudes. At 780 km the scale factors ranged from 0.1 to 1.8 for all models. However, for the Jacchia 1977 model, the average scale factor was 0.943, and represents the best model at that altitude. Computer timing was also done. For orbit computation, drag models need further improvement, and the Jacchia 1977 model seems the best available today in terms of accuracy and computational efficiency. |
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