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The physical conditions leading the sunspot penumbra decay are poorlyunderstood so far. We investigate the photospheric magnetic and velocityproperties of a sunspot penumbra during the decay phase to advance the currentknowledge of the conditions leading to this process. A penumbral decay wasobserved with the CRISP instrument at the Swedish 1m Solar Telescope on 2016September 4 and 5 in active region NOAA 12585. During these days, full-Stokesspectropolarimetric scans along the Fe I 630 nm line pair were acquired overmore than one hour. We inverted these observations with the VFISV code in orderto obtain the evolution of the magnetic and velocity properties. We complementthe study with data from instruments onboard the Solar Dynamics Observatory andHinode space missions. The studied penumbra disappears progressively in bothtime and space. The magnetic flux evolution seems to be linked to the presenceof Moving Magnetic Features (MMFs). Decreasing Stokes V signals are observed.Evershed flows and horizontal fields were detected even after the disappearanceof the penumbral sector. The analyzed penumbral decay seems to result from theinteraction between opposite polarity fields in type III MMFs and penumbra,while the presence of overlying canopies rules the evolution in the differentpenumbral sectors.

Penumbral decay observed in active region NOAA 12585