Statistics – Applications
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm51b0520h&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM51B-0520
Statistics
Applications
2722 Forecasting, 2764 Plasma Sheet, 2799 General Or Miscellaneous, 7855 Spacecraft Sheaths, Wakes, Charging
Scientific paper
We report on progress made toward the development of a geosynchronous spacecraft surface charging application that combines environmental results from the Magnetospheric Specification Model (MSM) with a minimal spacecraft approximation. Surface charging is identified as a net electron current to the kapton spacecraft determined by integrating electron, proton, and oxygen fluxes along with secondary and backscatter yields specified as a function of energy. A validation study of the MSM, covering 20-50 keV electrons from the Charge Control System (CCS) on a DSCS III B-7 spacecraft, indicated that the MSM consistently tracked the diurnal and seasonal variations of this energetic portion of the surface charging particle population [Hilmer and Ginet, J. Atmos. and Solar-Terr. Phys., 62, 1275, 2000]. Initial comparisons of on-orbit spacecraft frame charging measurements from CCS with results obtained using MSM output indicated that the MSM produced ion and electron fluxes, as well as evolving electron spectral features, well enough to reproduce geosynchronous spacecraft charging current densities in the two largest of three events studied in the geosynchronous environment. [Hilmer et al., Proc. of 7th SCTC, 23-27 April 2001, ESA SP-476, 235, 2001]. We will provide an overview of the updated MSM/charging algorithm simulations performed using a variety of input parameter combinations in order to quantify the potential benefits of integrating MSM environment specification with advanced charging codes such as NASCAP-2K to produce system-specific charging applications.
Cooke David L.
Hilmer Robert V.
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