Millimetric flux densities as a test of atmospheric turbulence |
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| Institution: | 1. Departimento di Fisica, Università di Roma “La Sapienza”, P.le Aldo Moro 2, I-00185 Roma, Italy;2. E.N.E.A. T.I.B., Frascati, Italy;3. Istituto Superiore Poste e Telecomunicazioni, Viale Europa 190, Roma, Italy;4. Istituto Astrofisica Spaziale/CNR, P.D. Box 67, 00044 Frascati, Italy;5. European Southern Observatory, Karl Schwarzschild straβe 2, D-8046 Garching bei, München, West Germany;1. GNSS Research Center, Wuhan University, No. 129 Luoyu Road, Wuhan 430079, China;2. School of Geodesy and Geomatics, Wuhan University, No. 129 Luoyu Road, Wuhan 430079, China;3. Jinan Institute of Surveying and Mapping, Jinan 250101, China;4. School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China;1. School of Earth and Planetary Sciences, Curtin University, Perth, Australia;2. State Key Laboratory of Geodesy and Earth’s Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, China;3. Institute of Geospatial Information, Information Engineering University, China;4. National Time Service Center, Chinese Academy of Sciences, Xi’an, China;5. University of Chinese Academy of Sciences, Beijing, China;6. State Key Laboratory of Satellite Navigation System and Equipment Technology, the 54th Research Institute of China Electronics Technology Group Corporation, Shijiazhuang 050081, China |
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| Abstract: | In this paper it is shown how submillimetre and millimetre flux density measurements of sky fluctuations can be used to infer the characteristics of atmospheric turbulence.Two different approaches have been followed: first, by considering the observed process as due to the atmospheric turbulence, we used the r.m.s. sky fluctuations to derive some physical parametres characterizing the phenomenon; second, by investigating the power spectrum and the autocorrelation function, we derive an empirical model (the AR model) to try to deduce the physical process. In this case, the fitted power spectrum agrees strikingly with that predicted by the theory of a stationary turbulent flow for the atmosphere in the sampled frequency range. This kind of modeling can help to disentangle the atmospheric fluctuations from the extraterrestrial signal in ground-based astrophysical measurements.Measurements of the water vapour content and atmospheric transmission at the Italian Base in Antarctica, where the data have been taken, at the wavelengths of 350 μm, 1 and 2mm are also reported. |
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