NSSC OpenIR  > 空间科学部
Active spacecraft potential control for Cluster - implementation and first results
Torkar, K.; Riedler, W.; Escoubet, C. P.; Fehringer, M.; Schmidt, R.; Grard, R. J. L.; Arends, H.; Rudenauer, F.; Steiger, W.; Narheim, B. T.; Svenes, K.; Torbert, R.; Andre, M.; Fazakerley, A.; Goldstein, R.; Olsen, R. C.; Pedersen, A.; Whipple, E.; Zhao, H.; 北京8701信箱
Source PublicationAnnales Geophysicae
KeywordSpace Plasma Physics Instruments Spacecraft Sheaths And Techniques Wakes Active Perturbation Experiments Charging Metal Ion-source Photoelectron Sheath Electric-field Magnetosphere Photoemission Mission
AbstractElectrostatic charging of a spacecraft modifies the distribution of electrons and ions before the particles enter the sensors mounted on the spacecraft body. The floating potential of magnetospheric satellites in sunlight very often reaches several tens of volts, making measurements of the cold (several eV) component of the ambient ions impossible. The plasma electron data become contaminated by large fluxes of photoelectrons attracted back into the sensors. The Cluster spacecraft are equipped with emitters of the liquid metal ion source type, producing indium ions at 5 to 9 keV energy at currents of some tens of microampere. This current shifts the equilibrium potential of the spacecraft to moderately positive values, The design and principles of the operation of the instrument for active spacecraft potential control (ASPOC) are presented in detail. Experience with spacecraft potential control from the commissioning phase and the first two months of the operational phase are now available. The instrument is operated with constant ion current for most of the time, but tests have been carried out with varying currents and a "feedback" mode with the instrument EFW which measures the spacecraft potential. That has been reduced to values according to expectations. In addition, the low energy electron measurements show substantially reduced fluxes of photoelectrons as expected. The flux decrease in photoelectrons returning to the spacecraft, however, occurs at the expense of an enlarged sheath around the spacecraft which causes problems for boom-mounted probes.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Torkar, K.,Riedler, W.,Escoubet, C. P.,et al. Active spacecraft potential control for Cluster - implementation and first results[J]. Annales Geophysicae,2001,19(40463):1289-1302.
APA Torkar, K..,Riedler, W..,Escoubet, C. P..,Fehringer, M..,Schmidt, R..,...&北京8701信箱.(2001).Active spacecraft potential control for Cluster - implementation and first results.Annales Geophysicae,19(40463),1289-1302.
MLA Torkar, K.,et al."Active spacecraft potential control for Cluster - implementation and first results".Annales Geophysicae 19.40463(2001):1289-1302.
Files in This Item:
File Name/Size DocType Version Access License
20011910121289.pdf(2301KB) 开放获取CC BY-NC-SAApplication Full Text
Related Services
Recommend this item
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Torkar, K.]'s Articles
[Riedler, W.]'s Articles
[Escoubet, C. P.]'s Articles
Baidu academic
Similar articles in Baidu academic
[Torkar, K.]'s Articles
[Riedler, W.]'s Articles
[Escoubet, C. P.]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Torkar, K.]'s Articles
[Riedler, W.]'s Articles
[Escoubet, C. P.]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.