Development of Faraday Cup onboard MS-T5 for Solar Wind Measurement

概要

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Faraday cup which will be installed in Japan's first interplanetary satellite, MS-T5 is nowready to go after three years' developing period. The cup which consists of four grids and ion collector was designed to measure ion density, bulk velocity and ion temperature by utilizing spacecraft spinning. The range of these parameters to be measured are few〜several ten ions/cc for ion density, 〜10^4 K for ion temperature and 300 Km〜700 km/sec for bulk velocity. Among three parameters to be measured, bulk velocity and ion density can be measured within 10% accuracy. Ion temperature can be obtained within the accuracy of 〜20%. What we have done so far are : (1) To study the basic physics on the ion response to the rapidly changing potential, (2) To get a theoretical description of ion current versus satellite spin angle, (3) To check the theoretical equation by means of laboratory experiment and finally (4) To make the software to process data after the satellite MS-T5 is launched. The report describes several useful findings which were made clear during the study listed above.
宇宙航空研究開発機構の論文