The trigger probe (TP) for the VEFI suite on the C/NOFS satellite. The collector and guard form a spherical probe, with the guard removing the non-uniformities introduced by the boom.
The variation of expected current collected per unit density as a function of (a) ion temperature, (b) reference potential, and (c) ion composition.
The ratio of PLP density (N i ) to trigger probe current (I TP) as a function of the fraction of O+ as measured by IVM for the four bias settings. The cyan lines represent the mean and standard deviation of the data; the red lines are the fit to the data.
The ratio of PLP density (N i ) to trigger probe current (I TP) as a function of the fraction of applied potential for four different levels of O+ composition.
Performance of the calibration method for total density for all days in 2011. The vertical dashed lines represent discrepancies of 30% versus the PLP density.
An example of plasma density structures where a changing composition results in a suppression of the features if the probe is uncalibrated.
Data used for each fit.
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