Data Processing of the magnetograms for the Near InfraRed Imaging Spectropolarimeter at Big Bear Solar Observatory

We want to present the processing result of the vector magnetograms from the Near InfraRed Imaging Spectropolarimeter (NIRIS) at Big Bear Solar Observatory. The NIRIS is a successor of an old magnetograph system at BBSO, which equips with the new infrared detector and the improved Fabry-Perot filter system. While there are several upgrades to the new hardware, there are also some challenges as the data acquisition rate increases and we deal with the a larger detector array. The overall process includes dark and flat correction, image alignment, de-stretch, Stokes parameter selection, calibration of instrumental crosstalk, and Milne-Eddington inversion.