Accession Number : ADA137131

Title :   Dual Maxwellian Space Plasma Modeling by the Logarithmic Method.

Descriptive Note : Physical sciences research papers,

Corporate Author : AIR FORCE GEOPHYSICS LAB HANSCOM AFB MA

Personal Author(s) : Besse,A L ; Rubin,A G ; Tautz,M F

PDF Url : ADA137131

Report Date : 05 Jul 1983

Pagination or Media Count : 14

Abstract : A common and useful practice in the study of spacecraft charging phenomena is the use of dual Maxwellian models of the particle distributions. These models frequently employ a least error fit to the logarithm of the measured distribution function over an energy range that may exceed three decades. By example, we demonstrate that the resulting models are not satisfactory for the calculation of spacecraft charging. The models do not have a sufficient number of adjustable parameters to fit the measured spectra over such a wide energy range. More satisfactory models are obtained by weighting the spectral data according to their relevance to the spacecraft charging phenomena under investigation. In addition, reasonable limits must be placed on the temperatures of the models to prevent the artifacts that have been experienced in a minority of cases. (Author)

Descriptors :   *MATHEMATICAL MODELS, *LOGARITHM FUNCTIONS, *SPACE CHARGE, SPACECRAFT, DISTRIBUTION FUNCTIONS, PLASMAS(PHYSICS), MAXWELLS EQUATIONS, SPECTRA

Subject Categories : Statistics and Probability
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE