Computer Science – Sound
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1039p&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, June 1991, p. 1039-1042.
Computer Science
Sound
15
Diurnal Variations, Extremely Low Frequencies, Man Environment Interactions, Polar Orbits, Satellite Sounding, Space Plasmas, Electric Fields, Satellite-Borne Instruments, Statistical Analysis
Scientific paper
Data from a low-orbiting satellite with a quasi-polar 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 largest difference between Monday and Saturday (93 percent) 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 only because power consumption is lower, but also because the ground configuration of their sources is changed.
Lefeuvre François
Mogilevskii M. M.
Molchanov Oleg A.
Parrot Michel
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