Development of solar reflector for geostationary spacecraft

Details Development of solar reflector for geostationary spacecraft Development of solar reflector for geostationary spacecraft

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.540...49h&link_type=abstract

In: Proceedings of the 9th International Symposium on Materials in a Space Environment, 16-20 June 2003, Noordwijk, The Netherla

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Space Environment, Materials, Solar Reflector

Scientific paper

In geostationary orbit, thermal control coatings are exposed to a continuous bombardment of electrical particles which have the capacity to charge the external surface of the satellite. The accumulation of implanted charges leads to differences of potential between many parts of the satellite and can induce electrostatic discharges which are detrimental to electronic equipment. To prevent this, coatings should have normalized characteristics like surface resistivity lower than 109Ω/[square unit] and bulk resistivity higher than 109Ω.m. The Materials and Coatings Laboratory of the Thermal Control Department of the CNES Toulouse Space Centre has already developed low cost cold coatings called Solar Reflectors (SR) to replace both Optical Surface Reflectors (OSR) and Second Surface Mirrors (SSM). SR have been qualified only for low earth orbit applications because they do not evacuate space charges. Today the laboratory is looking for a solution to be able to use SR in geostationary orbit. This paper describes the properties of a conductive and transparent oxide layer on the SR surface which could be used to obtain the specified characteristics for geostationary application. The behaviour towards space charges and towards other space elements like temperature, vacuum and ageing are analysed with and without the conductive layer.

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