JAXA Repository / AIREX 未来へ続く、宙(そら)への英知

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Other TitleA study on charging and discharging characteristics of metal-insulator surface under low earth orbit plasma environment
Author(jpn)呉地 淳一; 上坂 章人; 岡部 昭三
Author(eng)Kurechi, Junichi; Uesaka, Akihito; Okabe, Shozo
Author Affiliation(jpn)東海大学 工学部; 東海大学 工学部; 東海大学 工学部
Author Affiliation(eng)Tokai University School of Engineering; Tokai University School of Engineering; Tokai University School of Engineering
Issue Date2004-06
PublisherInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)
Publication title第23回宇宙エネルギーシンポジウム 平成15年度
The 23rd ISAS Space Energy Symposium March 9, 2004
Start page50
End page54
Publication date2004-06
AbstractIn general, a space system is charged negatively due to an action of space plasma. A number of works for charging and discharging phenomena of the solar cell array surface in the space system under LEO (Low Earth Orbit) have been carried out. In the future, it is expected that various structures composed of metal and insulator are installed in the surface of the space system which has various functions. It is important to work out what phenomena occur in the system. In this work, experiments are carried out to clarify charging and discharging phenomena under LEO plasma environment using some samples that composed of metal and insulator. When negative voltage is applied to the metal of the sample, micro discharges are observed in oscillating wave-form pulse current at all samples. When the applied voltage is increased, single polarity pulse discharges are observed. The single polarity pulse discharging occurs only on the metal surface and the charges of discharging from the metal are much less than the total charges of charging to the surface of the insulator. This discharging is taken place between the charges on the insulator surface and ion sheath forming near the metal. If minute projection parts exist on the metal surface, the discharging voltage lowers. In these cases, the charges of the single polarity discharging do not depend on the area of the metal and the existence of the insulator.
Keywordsaerospace environment; spacecraft charging; space plasma; low Earth orbit; electric discharge; metal surface; ion sheath; insulating film; 航空宇宙環境; 宇宙機帯電; 宇宙プラズマ; 低地球軌道; 放電; 金属表面; イオンシース; 絶縁フィルム
Document TypeConference Paper
JAXA Categoryシンポジウム・研究会

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