Abstract
Abstract : The mission of the P78-2 (SCATHA) satellite, launched in January 1979, is to measure parameters related to the spacecraft charging process near synchronous orbit. The Pulse Analyzer experiment onboard measures the shape of pulses on four sensors; 447 days of data have been analyzed. Thirty-four pulses on twenty different days have been related to electrical discharges with dominant frequencies between 5 and 32 MHz and peak amplitudes from 0.08 to 30.1 volts into a 50 ohm load. The amplitude of four of the pulses exceeded by a factor of five those measured during systems factory tests. This indicates that the present test specification is inadequate to simulate the EMI levels experienced by a payload from worst-case on-orbit discharges. (Author)
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