The ESA/NASA Solar Orbiter space mission has been successfully launched in February 2020. Onboard is the Polarimetric and Helioseismic Imager (SO/PHI), which has two telescopes, a High Resolution Telescope (HRT) and the Full Disc Telescope (FDT). The instrument is designed to infer the photospheric magnetic field and line-of-sight velocity through differential imaging of the polarised light emitted by the Sun. It calculates the full Stokes vector at 6 wavelength positions at the Fe I 617.3 nm absorption line. Due to telemetry constraints, the instrument nominally processes these Stokes profiles onboard, however when telemetry is available, the raw images are downlinked and reduced on ground. Here the architecture of the on-ground pipeline for HRT is presented, which also offers additional corrections not currently available on board the instrument. The pipeline can reduce raw images to the full Stokes vector with a polarimetric sensitivity of 10−3⋅Ic or better.
@article{arxiv.2208.14904,
title = {The on-ground data reduction and calibration pipeline for SO/PHI-HRT},
author = {J. Sinjan and D. Calchetti and J. Hirzberger and D. Orozco Suárez and K. Albert and N. Albelo Jorge and T. Appourchaux and A. Alvarez-Herrero and J. Blanco Rodríguez and A. Gandorfer and D. Germerott and L. Guerrero and P. Gutierrez Marquez and F. Kahil and M. Kolleck and S. K. Solanki and J. C. del Toro Iniesta and R. Volkmer and J. Woch and B. Fiethe and J. M. Gómez Cama and I. Pérez-Grande and E. Sanchis Kilders and M. Balaguer Jiménez and L. R. Bellot Rubio and M. Carmona and W. Deutsch and G. Fernandez-Rico and A. Fernández-Medina and P. García Parejo and J. L. Gasent Blesa and L. Gizon and B. Grauf and K. Heerlein and A. Korpi-Lagg and T. Lange and A. López Jiménez and T. Maue and R. Meller and H. Michalik and A. Moreno Vacas and R. Müller and E. Nakai and W. Schmidt and J. Schou and U. Schühle and J. Staub and H. Strecker and I. Torralbo and G. Valori},
journal= {arXiv preprint arXiv:2208.14904},
year = {2022}
}