SCATHA (Spacecraft Charging At High Altitudes)
SpacecraftSpin stabilized (~1 rpm) with 5° pointing accuracy. Hydrazine propulsion system with 8 thrusters and 2 tanks. Body mounted solar cells generated 290 watts. Three 8Ahr NiCd batteries. Downlink at 8.2 kbps at S-Band from redundant 10 W transmitters. Aluminum, titanium, magnesium, glass fiber structure. Seven deployed experiment booms. 2 tape recorders with ~350 Mb storage each.
PayloadSCATHA carried 12 experiments, which had a total mass of 87 kg and consumed 110 W. The experiments were as follows:
SC1 Engineering Experiments plus VLF and HF Receivers – measured surface potentials of various spacecraft materials, measured RF waves between 0-300 kHz, 2-30 Mhz.
SC2 Spacecraft Sheath Fields Plus Energetic Ions – measured low energy electrons and ions, energetic protons, and electrons.
SC3 High Energy Particle Spectrometer – measured high energy electrons and protons.
SC4 Satellite Electron and Positive Ion Beam System – used ion and electron beam guns to control spacecraft surface potential.
SC5 Rapid Scan Particle Detector – measured electrons and ions.
SC6 Thermal Plasma Analyzer (failed soon after initial turn on) – designed to measure thermal electrons and ions.
SC7 Light Ion Mass Spectrometer (failed soon after initial turn on) – designed to measure light ion density, temperature and composition.
SC8 Energetic Ion Compositions Experiment – measured low energy electrons and the ion composition of energetic plasma.
SC9 UCSD Charged Particle Experiment – measured electrons and ions.
SC10 Electric Field Detector – measured DC and ELF electric fields and satellite potential.
SC11 Magnetic Field Monitor – measured DC and ELF magnetic fields.
ML12 Spacecraft Contamination Plus Thermal Control Materials Monitoring – measured contamination rates and property changes of several thermal control material samples.
TPM Transient Pulse Monitor – supported the other experiments by providing supporting data about the electromagnetic pulse environment.
Related category SATELLITES AND SPACE PROBES
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