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For accurate measurements\ud of electric fields, spherical double probes are electronically controlled to be\ud at a positive potential of approximately 1 V relative to the ambient\ud magnetospheric plasma. The spacecraft will acquire a potential which balances\ud the photoelectrons escaping to the plasma and the electron flux collected from\ud the plasma. The probe-to-plasma potential difference can be measured with a\ud time resolution of a fraction of a second, and provides information on the\ud electron density over a wide range of electron densities from the lobes (~ 0.01\ud cm-3) to the magnetosheath (>10 cm-3) and the\ud plasmasphere (>100 cm-3). This technique has been perfected and\ud calibrated against other density measurements on GEOS, ISEE-1, CRRES, GEOTAIL\ud and POLAR. The Cluster spacecraft potential measurements opens the way for new\ud approaches, particularly near boundaries and gradients where four-point\ud measurements will provide information never obtained before. Another\ud interesting point is that onboard data storage of this simple parameter can be\ud done for complete orbits and thereby will provide background information for\ud the shorter full data collection periods on Cluster. Preliminary calibrations\ud against other density measurements on Cluster will be reported. Key words. Magnetospheric physics\ud (magnetopause, cusp, and boundary layers) Space plasma physics (spacecraft\ud sheaths, wakes, charging; instruments and techniques

Four-point high time resolution information on electron densities by the electric field experiments (EFW) on Cluster