Abstract
The aim of this paper is to review the most relevant characteristics of Power Line Harmonic Radiation (PLHR) that have been observed from satellites. Fifteen years ago, just after publications of results from the ARIEL-3 and -4 satellites, a large debate occurred about the influence of this phenomenon on natural wave emissions. New data were recently published concerning observations made from the low-altitude satellite AUREOL-3. These data indicate strong evidence for man-made influences on the ionosphere and magnetosphere. All the previous observations will be presented, with their main features. This paper also discusses the possible origin of magnetospheric lines that have been reported. The influence of man-made emissions will be evaluated and compared with other sources of energy in the Earth's environment.
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