MAGNETIC RADIATIONS FROM HARNESS WIRES OF SPACECRAFT

Radiation properties of magnetic noise from the harness wires of a spa cecraft (GEOTAIL) have been studied experimentally and theoretically. A simulation experiment on the noise radiation using a minimum set of subsystems of the spacecraft has shown that the intensity and the dire ctional patterns of the noise radiation from the wires were largely ch anged by the existence of a conductive plate near the harness wires. T he change in the noise characteristics is explained by eddy currents i nduced in the conductive plate by the signal current flowing in the wi res. The eddy currents distributed in the conductive plate were calcul ated by the Finite Element analysis Method (FEM). The magnetic flux de nsities calculated from both the source signal current and its induced eddy currents for the wiring configuration of the simulation experime nt have shown to be consistent with the values obtained in the experim ent. The results in the present study have provided us an important in formation on a wiring method to diminish noise radiation from harness wires.