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... Such a capacitance can be estimated by considering a spherical capacitor with the inner electrode having a radius equal to that of EFD probe separated by a Debye length from the outer electrode representing the unperturbed plasma [7]. The capacitance associated with such element is of the order of 10 pF, varying with the electron temperature and density between about 5 pF and 30 pF [8]. ...
Model predictions are presented to evaluate the electrodynamic parameters as expected at the orbit of China Seismic-Electromagnetic Satellite (CSES). The main objective of this paper is that of improving the accuracy of the Electric Field Detectors (EFDs) which are installed on CSES and will measure the field vector in a wide band from DC up to 3.5MHz. The electric field components are derived from the probe floating potential readings, thus an accurate characterization of the space environment is needed to model the currents collected from the ionosphere and establish the EFD probe response. The plasma environment and the magnetic field along the orbit are determined using the standard IRI and IGRF models. Simulations are used to determine the bias currents which have to be applied to the probes to minimize the contact impedance between the EFDs and the ionospheric plasma. Correction voltages required to remove the vB electric field from the EFD measurements are also estimated.
