Finite grid radius and thickness effects on retarding potential analyzer measured suprathermal electron density and temperature

Details Finite grid radius and thickness effects on retarding potential analyzer measured suprathermal electron density and temperature Finite grid radius and thickness effects on retarding potential analyzer measured suprathermal electron density and temperature

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9713767k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A9, Sept. 1, 1992, p. 13,767-13,775.

Statistics

Computation

2

Computational Grids, Hot Electrons, Ionospheric Electron Density, Plasma Diagnostics, Venus Atmosphere, Electron Distribution, Electron Gas, Least Squares Method, Thickness

Scientific paper

The effect of finite grid radius and thickness on the electron current measured by planar retarding potential analyzers (RPAs) is analyzed numerically. Depending on the plasma environment, the current is significantly reduced below that which is calculated using a theoretical equation derived for an idealized RPA having grids with infinite radius and vanishingly small thickness. A correction factor to the idealized theoretical equation is derived for the Pioneer Venus (PV) orbiter RPA (ORPA) for electron gasses consisting of one or more components obeying Maxwell statistics. The error in density and temperature of Maxwellian electron distributions previously derived from ORPA data using the theoretical expression for the idealized ORPA is evaluated by comparing the densities and temperatures derived from a sample of PV ORPA data using the theoretical expression with and without the correction factor.

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