Modeling GRACE-FO accelerometer data for the version 04 release

GRACE and GRACE-FO require the reduction of non-gravitational accelerations, through an onboard accelerometer, to accurately estimate variations in Earth’s gravitational field. Accuracy accelerometer measurements is vital this mass change recovery significant errors will reduce quality recovered science data. This paper describes our current characterization error sources accelerometers mitigation strategies used generation JPL/CSR Version 04 data for public release. Our model flicker noise on readings one plate pair GRACE-D, impulse response limitations both accelerometers, nonphysical once per revolution roll angular acceleration correlated all axes nominal thermal bias dependencies expected inter-measurement aliasing (cross-talk - as heritage from GRACE). Attitude reconstruction incorporating star camera, inertial measurement unit, magnetorquer visibly improve independent accelerometer. Error linear measurements, associated with calibrated product provided version release, dramatically estimates gravity While many characterizations described here are not necessary constructing transplant GRACE-C currently done lay groundwork future use calibrated/corrected GRACE-D