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Active Spacecraft P...
Active Spacecraft Potential Control in the MMS Mission : Results from Six Years in Orbit
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- Torkar, K. (författare)
- Space Research Institute, Austrian Academy of Sciences, Graz, Austria, 8042
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- Nakamura, R. (författare)
- Space Research Institute, Austrian Academy of Sciences, Graz, Austria, 8042
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- Roberts, O. W. (författare)
- Space Research Institute, Austrian Academy of Sciences, Graz, Austria, 8042
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- Jeszenszky, H. (författare)
- Space Research Institute, Austrian Academy of Sciences, Graz, Austria, 8042
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- Lindqvist, Per-Arne (författare)
- KTH,Rymd- och plasmafysik
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- Khotyaintsev, Y. (författare)
- Swedich Institute of Space Physics, Uppsala, Sweden, 751 21
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- Giles, B. L. (författare)
- NASA, Goddard Space Flight Center, Greenbelt, MD, USA, 20771
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- Barrie, A. C. (författare)
- NASA, Goddard Space Flight Center, Greenbelt, MD, USA, 20771
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(creator_code:org_t)
- Institute of Electrical and Electronics Engineers (IEEE), 2023
- 2023
- Engelska.
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Ingår i: IEEE Transactions on Plasma Science. - : Institute of Electrical and Electronics Engineers (IEEE). - 0093-3813 .- 1939-9375. ; 51:9, s. 2461-2467
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The four spacecraft of the NASA Magnetospheric Multiscale (MMS) mission carry instruments to reduce the positive potential by means of indium ion beams. Since the start of the nominal mission in September 2015 and until the end of 2021, the instruments active spacecraft potential control (ASPOC) have been actively operating for more than 16 000 h at a nominal emission current of $20 \mu \text{A}$ per spacecraft. Based on data from more than six years in orbit with more than 50 000 h in regions of scientific interest, statistical results regarding the potential's interdependencies with ambient plasma were obtained. This article reports on the derivation of the photo electron energy spectrum from the correlation between the potential and the plasma data obtained by the fast plasma instrument with and without controlled potential. Finally, the time constants during the relaxation of the controlled potential when the active control instrument is turned off, if measured at high time resolution, allow to estimate the electric capacitance of the spacecraft system.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Nyckelord
- Electrostatic potentials
- ion emission
- magnetosphere
- plasma measurements
- solar wind
- space vehicles
- surface charging
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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