Abstract
Abstract The double probe technique is one of the standard techniques for in situ DC electric field measurements in tenuous plasmas, but it is known for its sensitiveness to the plasma environment around a spacecraft. In the present study we compare the double-probe electric fields obtained by Geotail/EFD-P with the convection electric fields - V × B in various regions of the distant tail. We have found that the sensitivity (effective length of the double probes) varies as a function of the spacecraft potential, and the offset weakly depends on the electron temperature of ambient plasma. Using this result, an empirical calibration formula for the double-probe electric fields is obtained.
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