was significant effort made to design sensors with synchronized timing with pre-launch end-to-end characterization of sensor performance intended to enable optimal merging of the in-flight magnetic field data [@Torbert2016; @Fischer2016]. The shared clock between the FIELDS SCM and MAGs, as well as their simultaneous continuous survey mode operation, likewise facilitates a merged SCM and MAG (SCaM) data product. In order to produce the merged SCaM data product, accurate representations for the complex frequency responses for the individual sensors are required. In addition to the individual characterization of the instruments, multiple efforts were made to inter-calibrate the sensors; however, no strict end-to-end calibration was performed as in [@Fischer2016]. Original ground testing was performed at the Acuña Test facility using FIELDS engineering model hardware; subsequent testing was performed on flight model hardware during final stages of integration onto the PSP spacecraft, verifying the instrument gain and phase characteristics. In addition to the characterization of frequency response, the merged SCaM data product ideally attains minimal noise characteristics. Accordingly, an accurate description of the individual MAG and SCM sensor noise floors is necessary.

To provide an optimal signal to noise merging coefficients, the noise floors of each instrument are assumed to be incoherent, mean 