Mathematics
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982giot.rept...25m&link_type=abstract
In ESA GIOTTO Spacecraft Gas and Plasma Environ. p 25-33 (SEE N82-25962 16-75)
Mathematics
European Space Programs, Halley'S Comet, Mathematical Models, Plasma-Electromagnetic Interaction, Solar Arrays, Spacecraft Charging, Cosmic Plasma, Current Density, Electric Potential, Panels, Photoelectrons, Plasma Density, Plasma Temperature, Quartz, Three Dimensional Models
Scientific paper
Two-dimensional (cylindrically symmetric thick sheath approximation) and three dimensional (spherically symmetric) models of Giotto solar panel charging are presented. An element of the quartz layer on the panels is regarded as a capacitor with a fixed potential at one plate, representing the floating potential of the inner structure of the spacecraft. This capacitor is charged by the current density of photoelectrons and by plasma electrons leaving or striking the surface. The charging equation can be integrated numerically, using the current densities of the photoelectrons and ambient plasma electrons. An iterative procedure is employed in order to satisfy the boundary value of the surface potential on solar panels. Results are similar for both models, with differences occuring only on the sunlit side of the panels. Near the comet nucleus, differential charging of 10V is predicted. Plasma analyzer functioning will not be affected by this charging.
Isensee U.
Maassberg H.
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