Improvements to the AMISR Resolved Vector Velocities Data Product

The Advanced Modular Incoherent Scatter Radars (AMISR) are monostatic phased-array incoherent scatter radars.  A technique for estimating the 3D plasma drift velocity vectors from line-of-sight velocity measurements across the radar field-of-view was originally published in Heinselman and Nicolls [2008].  We discuss recent improvements to this algorithm, including better error filtering and more rigorous treatment of magnetic coordinate systems, as well as a re-examination of the underlying assumptions.  These improvements result in better fidelity of the resolved vector velocities data product, which generally now cover a larger geographic area with smaller errors. Initial results are discussed, as well as next steps for the resolved vector velocities data product.