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Prediction of large negative shaded-side spacecraft potentialsA calculation by Knott, for the floating potential of a spherically symmetric synchronous-altitude satellite in eclipse, was adapted to provide simple calculations of upper bounds on negative potentials which may be achieved by electrically isolated shaded surfaces on spacecraft in sunlight. Large (approximately 60 percent) increases in predicted negative shaded-side potentials are obtained. To investigate effective potential barrier or angular momentum selection effects due to the presence of less negative sunlit-side or adjacent surface potentials, these expressions were replaced by the ion random current, which is a lower bound for convex surfaces when such effects become very severe. Further large increases in predicted negative potentials were obtained, amounting to a doubling in some cases.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Prokopenko, S. M. L.
(Young (Arthur) and Co. Bethesda, MD, United States)
Laframboise, J. G.
(Young (Arthur) and Co. Bethesda, MD, United States)
Date Acquired
August 9, 2013
Publication Date
February 24, 1977
Publication Information
Publication: NASA. Lewis Res. Center Proc. of the Spacecraft Charging Technol. Conf.
Subject Category
Electronics And Electrical Engineering
Accession Number
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.
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