Accession Number : ADA140077

Title :   Summary of Environmentally Induced Electrical Discharges on the P78-2 (SCATHA) Satellite.

Descriptive Note : Technical rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA SPACE SYSTEMS DIV

Personal Author(s) : Koons,H C

PDF Url : ADA140077

Report Date : 30 Sep 1983

Pagination or Media Count : 36

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)

Descriptors :   *Spacecraft components, *Electric discharges, Space charge, Space environments, Electrical conductivity, Scientific satellites

Subject Categories : Electricity and Magnetism
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE