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Journal Articles Geophysical Research Letters Year : 1991

Daily variations of ELF data observed by a low-altitude satellite


Data from a low-orbiting satellite with a quasipolar orbit have been studied to determine if man-made waves, such as the Power Line Harmonic Radiations (PLHR), can affect the intensity of the ELF waves observed in the ionosphere. The signals coming from two electric components were processed with a system of 6 filters (from 10 Hz up to 1000 Hz), and recorded on-board all around the Earth. Most ELF waves derive from electrostatic turbulence. It is shown that the signal recorded by the electric component that is parallel to the Earth's magnetic field has a modulation depending of the days of the week. The amplitude is maximum on Monday and decreases until Saturday. The largest difference between Monday and Saturday (93%) occurs with the filter centered around 72 Hz. The interpretation of the experimental results supposes that the intensity of the ELF waves is connected to the PLHR influence on the ionospheric plasma. A theory is presented to explain this variation: the PLHR emitted from the ground during weekdays are different from those of the weekend, not 0nly because power consumption is lower, but also because the ground configuration of their sources is changed. 1955, 9600 TWh in 1985. The propagation of the PLHR through the magnetosphere was first observed by Helliwell et al. [1975], but only on the ground at a conjugate point of an industrialized region. Similar 6bservations on the ground were made from different places by Matthews and Yearby [1981] and Kimura et al. [1987]. Rare and weak PLHR emissions were observed onboard the satellites ISEE-1 [Bell et al., 1982] above North America and AUREOL-3 [Berthelier eta!., 1982] above Western Europe. However, studies with the low-altitude
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insu-03039738 , version 1 (04-12-2020)



Michel Parrot, O. A Molchanov, M. M Mogilevski, François Lefeuvre. Daily variations of ELF data observed by a low-altitude satellite. Geophysical Research Letters, 1991, 18 (6), pp.1039-1042. ⟨10.1029/91GL01352⟩. ⟨insu-03039738⟩
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