Density–Temperature Constraint From Fixed-Bias Spherical Langmuir Probes

In a recent paper, we showed that a combination of analytic and multivariate regression models can be used to infer a satellite floating potential, from currents collected by a pair of fixed-bias spherical Langmuir probes. In this article, we show that such an instrument can also be used to infer the ratio of the plasma density and the square root of the electron temperature. This simple function, in turn, can provide a useful constraint and improve accuracy when density and temperature are measured independently.