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The ESA/NASA Solar Orbiter space mission has been successfully launched inFebruary 2020. Onboard is the Polarimetric and Helioseismic Imager (SO/PHI),which has two telescopes, a High Resolution Telescope (HRT) and the Full DiscTelescope (FDT). The instrument is designed to infer the photospheric magneticfield and line-of-sight velocity through differential imaging of the polarisedlight emitted by the Sun. It calculates the full Stokes vector at 6 wavelengthpositions at the Fe I 617.3 nm absorption line. Due to telemetry constraints,the instrument nominally processes these Stokes profiles onboard, however whentelemetry is available, the raw images are downlinked and reduced on ground.Here the architecture of the on-ground pipeline for HRT is presented, whichalso offers additional corrections not currently available on board theinstrument. The pipeline can reduce raw images to the full Stokes vector with apolarimetric sensitivity of $10^{-3}\cdot I_{c}$ or better.

The on-ground data reduction and calibration pipeline for SO/PHI-HRT