Two-years of In-flight Spectrometer Calibration Results for the Fast Plasma Investigation (FPI) on the Magmetospheric Multiscale (MMS) Mission

Scientifically accurate measurements depend on careful calibration of in-flight instrumentation. We review two years of calibration results for the Fast Plasma Investigation (FPI) electron and ion spectrometers over the MMS fleet. We focus on the operating point calibration by which the operating voltage on each of the 64 spectrometers is set to best balance between gain, signal loss, and anode-to-anode cross talk. In addition, we map the calibration and housekeeping telemetry to infer charge extracted evolution from the microchannel plates and, subsequently, the project lifetime of the instrumentation.