Environmental assessment A series of studies being conducted by DOE to determine the effects of SPS on the environment. Subjects include biological effects of microwaves, the effects of high energy atomic particles in geostationary space on space workers, the effects of reflected light from satellites, the impacts on optical astronomy and on ecology, the effects of SPS microwave beams on radio astronomy, the effects on telecommunication systems, etc. Exclusion area The area surrounding a receiving antenna (rectenna) from which people and possibly other creatures will be excluded in order to prevent any microwave-induced damage. Faceted Denotes a solar concentrator that uses a series of reflective, plane surfaces to intensify solar radiation. Full sun The amount of power density received at the surface of earth at noon on a clear day -- about IDOmW cm , Lower levels of sunlight are often expressed as a 0.5 sun or 0.1 sun. A figure of 0.5 sun indicates half the power density of a full sun. Gallium arsenide A chemical compound including the elements gallium, arsenic, and another element or a radical. Solar cells are often coated with this to improve efficiencies. Gallium aluminum arsenide A chemical compound including the elements gallium, arsenic and aluminum. Geodesic dome A hemispherically shaped structure made of plane surfaces. Pioneered by R. Buckminster Fuller.
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