Abstract
A statistical analysis of the behavior of the characteristic frequency f 0 F2 during the seven days of the week in 1987 is performed. Italian data from a station in Rome situated in an industrial center and from a station in Gibilmana, which is located in a rural area, are used. Since industrial activity in European countries decreases rapidly during weekends, the behavior of the density of the F2 layer shows weekly periodicity. By expansion of this quantity in a Fourier series it is found that the intensity of the second harmonic with period T=12 h increases at the end of the work week. Moreover, the correlation coefficient between pairs of successive days increases monotonically during the week. Since this correlation coefficient is directly connected with the phase shift of the harmonics from one day to the next, it can be concluded that industry influences systematically the behavior of the ionospheric density over industrial centers. Conceivably, this effect is due to local random heating of the ionosphere by anthropogenic infrasound waves.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 39, No. 2, pp. 250–259, February, 1996.
This work was done within the framework of collaboration between the United Institute for Physics of the Earth, Moscow, Russia, and the University of Potsdam, Germany, in the joint project on “Nonstationary and Turbulent Processes in Ionospheric Plasma”. The authors are grateful to Deutsche Forschungsgemeinschaft for the financial support. These investigations were supported by the George Soros International Foundation and the Russian Fund for Fundamental Research under Joint Grant JA0100.
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Popov, K.V., Liperovsky, V.A., Meister, C.V. et al. Weekly anthropogenic phenomena in the F2 layer of the ionosphere. Radiophys Quantum Electron 39, 173–178 (1996). https://doi.org/10.1007/BF02275372
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DOI: https://doi.org/10.1007/BF02275372