Interpolation of 3D AMISR Data for Model Integration

The Advanced Modular Incoherent Scatter Radars (AMISR) are ground-based electronically steerable radars that measure plasma parameters in a 3D volume in the ionosphere. AMISR measurements are a critical diagnostic of ionospheric dynamics on scales from 50-500 km. Because AMISR datasets image 3D plasma density structures, they are potentially valuable input for physics-based plasma dynamics and raytracing models, however, by nature AMISR collects measurements in an irregular fan shape whereas most models require input on a dense, regular grid. Native AMISR measurements must be interpolated to the desired grid, but many traditional error-weighted interpolation algorithms do not generalize to 3D easily. Furthermore, numerical models are very sensitive to artifacts and often require a smooth transition to a larger background model outside the AMISR field of view. We present specific challenges in integrating AMSIR data with numerical models, as well as interpolation techniques to address these challenges.