Parallel Analysis of Spectro-Polarimetric Signals in Heterogeneous Grids, Using OPeNDAP BES to Perform Scatter-Gather High Performance Computing.

Determination of the magnetic field of the Sun's photosphere from spectral images requires a complex mathematical process that translates into intense computational effort. Since each individual pixel of the image is independent of all others, this problem is well suited for scatter-gather parallel computing. At the High Altitude Observatory, we have constructed a dedicated Grid with the help of OPeNDAP version 4, also known as Back-End-Server (BES), as the middleware that facilitates all the interprocess communication required to find the complete cohesive solution for each dataset. This paper describes in detail the parallel approach taken to speed up the computation of the solution, as well as the specifics of the Grid design.