Physics – Plasma Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm13a0328m&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM13A-0328
Physics
Plasma Physics
6914 Electromagnetic Noise And Interference, 6964 Radio Wave Propagation, 6984 Waves In Plasma (7867), 7800 Space Plasma Physics, 7839 Nonlinear Phenomena (4400, 6944)
Scientific paper
Spacecrafts have many sensors and instruments onboard themselves to observe various scientific data in space plasma. It is very important for electromagnetic compatibility (EMC) requirements of spacecrafts to identify the propagation characteristics of electromagnetic noises emitted from instruments onboard themselves. To solve this problem of EMC requirements of spacecraft, we developed a FDTD simulation code which can treat wave propagations in magnetized plasma, and performed FDTD simulations of electromagnetic noises which propagate in space plasma. Though we need to perform full particle simulations in order to recognize complete characteristic of waves propagating in space plasma, FDTD simulations can be performed with much less computer resources than those necessary for full particle simulations, in memories as well as cpu time. In providing EMC requirements of spacecrafts, we have to perform many simulations with various conditions, therefore, FDTD simulation is a very effective method. In this study, we study about sheilding effects of the conductive hood onboard spacecraft in preventing electromagnetic noises emitted from the spacecraft itself. Especially, we focus on the influences of the angle of the conductive hood and the direction of the ambient magnetic fields. We performed a series of three-dimensional FDTD simulations of electromagnetic noises around spacecraft in magnetized plasma, and confirmed shielding effects of the conductive hood onboard spacecraft. We input gaussian pulses as a wave source of electromagnetic noises. At first, we assume the ambient mangetic field parallel to the z-axis. Since FDTD simulations can be performed with less computer resources, we can perform many simulation experiments with various conditions. In this study, we perform a series of simulations with varying the shape of conductive hood and the direction of the ambient magnetic field. This method with FDTD simulations is very effective tool for providing EMC requirements of spacecrafts in space plasma.
Amagasu Y.
Ishisaka K.
Maeda Hideki
Miyake Takashi
Okada Taka
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