Numerical Simulation of High-Voltage Charging at High Altitudes; Comparison of NASCAP and ECO-M

Details Numerical Simulation of High-Voltage Charging at High Altitudes; Comparison of NASCAP and ECO-M Numerical Simulation of High-Voltage Charging at High Altitudes; Comparison of NASCAP and ECO-M

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996esasp.392..197d&link_type=abstract

Environment Modelling for Space-based Applications, Symposium Proceedings (ESA SP-392). ESTEC Noordwijk, 18-20 September 1996. E

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Computer simulation of spacecraft (SC) charging is one of the main means for the analysis of SC interaction with the hot plasma space environment. Results of two computer codes are presented: NASCAP and ECO-M. Both were applied to the simulation of high-voltage charging of a rotating SC. The analysed SC model is a conducting cylinder covered by thin dielectric material. The plasma environment, solar irradiation, secondary emission and other parameters correspond to realistic conditions for SC in geostationary orbit during a magnetic substorm. Two cases were analysed by both codes: 1) a continuously rotating cylinder; b) rotation starts after equilibrium charging was reached for a fixed orientation. In the first case the potential of illuminated SC surfaces increases steadily from O up to a steady-state level with oscillations resulting from the SC rotation frequency. In the second case a rapid potential jump after the beginning of rotation is observed. The potential of initially illuminated surface is changed from -3kV up to +3kV relative to space. A physical explanation of this effect is suggested. The main results of the computer simulations are:
(a) a good agreement between ECO-M and NASCAP results, (b) SC rotation has a large influence on the high-voltage charging processes, (c) transition from eclipse to sunlight conditions could lead to sudden jumps of surface potentials.

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