ICRU currently recommends use of the sievert (Sv) as the measure of dose equivalent; 1 Sv is equal to 100 rem. Solar cell: A photovoltaic cell that converts light energy into electrical energy. Solar radiation: The total electromagnetic radiation emitted by the sun. Solar particle event (SPE): An event caused by large magnetic upheavals on the solar surface which accelerate protons—and to a lesser extent, heavier nuclei—to high energies and projects these particles into space. South Atlantic Anomaly: A region of the trapped particle zones which dips close to Earth in the southern Atlantic Ocean southeast of the Brazilian coast. This area is the most important source of radiation for space workers in LEO. SPS: Satellite power systems. Transfer ellipse (TE): The path followed by a space vehicle in moving from one point in space to another (for example, from LEO to GEO).
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