Plasma Interactions with Spacecraft. Volume 2, NASCAP-2K Scientific Documentation for Version 4.1

Abstract

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Space Weather Influence on Electromagnetic Geosynchronous Debris Perturbations Using Statistical Fluxes

“…Backscattering occurs when an electron is reflected from the spacecraft rather than absorbed. This analysis uses the model for energy‐dependent backscattering provided in Davis and Mandell (): where E is the landing energy in keV, H ( x ) is the Heaviside step function, and Z is the atomic number of the material (aluminum in this analysis). The formulas above can be added to produce the total yield Y ( E ) = η ( E ) + δ ( E ) for normally incident monoenergitic electrons.…”

“…However, since the ion current is usually much smaller than the electron current, ion‐induced SEE is neglected in many cases. In this analysis the two parameter Nascap‐2k model Davis and Mandell () is used where E is the energy in keV and for aluminum β = 1.36 and E M = 40 are fitting parameters.…”

Spacecraft Charging Modeling - Nascap-2k

“…We computed the sheath structure and ion collection using a hybrid PIC approach with PIC ions and fluid barometric electron densities [1]. The plasma response, collected ion currents, and chassis floating potential were computed self-consistently with a 1 kV near-square-wave bias applied to the antenna elements.…”

“…We used the results of these calculations to calculate the current flowing along the antenna elements, the electron current density throughout the surrounding volume, and the vector potential field [1]. One of the results of the pseudopotential algorithm used to compute the current flowing along each antenna element is the injected current.…”