Semi-annual variation of the thermospheric density |
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| Institution: | 1. National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China;2. University of Chinese Academy of Sciences, Beijin 100039, China;3. Aerospace Information Research Institute, Chinese Academy of Science, Beijin 100094, China;4. China Xi''an Satellite Control Center, Xi’an 710043,China;1. Beijing Institute of Spacecraft Environment Engineering, China Academy of Space Technology, Beijing, 100094, China;2. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China;1. GMV, 11 Isaac Newton, 28670 Tres Cantos, Madrid, Spain;2. Universidad Carlos III de Madrid, 30 Avenida Universidad, 28911 Leganés, Madrid, Spain;1. Department of Aerospace Engineering, Khalifa University of Science and Technology, Abu Dhabi P.O. Box 127788, United Arab Emirates;2. Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), Gran Capità s/n, 08034 Barcelona, Spain;1. Scientific Computing Group (GRUCACI), University of La Rioja, Madre de Dios 53, 26006 Logroño, Spain;2. Scientific Computing Group (GRUCACI), University of La Rioja, San José de Calasanz 31, 26004 Logroño, Spain;3. Scientific Computing Group (GRUCACI), University of Granada, Santander 1, 52005 Melilla, Spain |
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| Abstract: | Thermospheric densities were determined from the orbital data of four satellites covering a height range of 266 to 500 km during 1975 to 1982. Using three different thermospheric models (DTM, MSIS, C), the index characterizing the semi-annual density variation was computed and analysed with respect to height and time using a regression by Fourier series. A general formula for the semi-annual density variation was derived. The new formula gives results similar to CIRA 72 at lower heights but displays a greater range of amplitudes at higher altitudes and a shift of extrema with growing height towards later days. |
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