Emissions from orbiting tethered satellite systems to the Earth´s surface: data analysis

During two different space missions involving tethered satellites, two ground measurement experiments were performed. The aim of both experiments was the observation at the Earth´s surface of spontaneous and man-made emissions propagating from the orbiting system through the Earth-ionosphere cavity. The first one was carried out in July 1992 on Tenerife (Canary island, Spain), within the framework of the ASI (Italian Space Agency) and NASA mission STS46-TSSI (Tethered Satellite System 1). The second one, related to NASA-PMG (Plasma Motor Generator) space mission, was carried out at Hilo, Hawaii, in June 1993. In this paper some results of data analysis are presented and comparisons between Tenerife and Hilo measurements are shown