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A thorough multiwavelength, multiheight study of the vector magnetic field ina compact active region (AR) filament (NOAA10781) is presented. We suggest anevolutionary scenario for this filament. Full Stokes vectors were acquired withTIP-II in a spectral range which comprises the chromospheric He I 10830 Amultiplet and the photospheric Si I 10827 A line. An AR filament (that wasformed before our observing run) was detected in the He I absorption images on2005 July 3rd. The chromospheric vector magnetic field in this portion of thefilament was strongly sheared whereas the photospheric field lines underneathhad an inverse polarity configuration. From July 3rd to July 5th, an openingand closing of the polarities at either side of the polarity inversion line(PIL) was recorded, resembling the recently discovered process of the slidingdoor effect seen by Hinode. During this time, a newly created region thatcontained pores and orphan penumbrae at the PIL was observed.On July 5th, anormal polarity configuration was inferred from the chromospheric spectra,while strongly sheared field lines aligned with the PIL were found in thephotosphere. In this same data set, the spine of the filament is also observedin a different portion of the FOV and is clearly mapped by the Silicon linecore. The inferred vector magnetic fields of the filament suggest a flux ropetopology. Furthermore, the observations indicate that the filament is dividedin two parts, one which lies in the chromosphere and another one that staystrapped in the photosphere. Therefore, only the top of the helical structure isseen by the Helium lines. The pores and orphan penumbrae at the PIL appear tobe the photospheric counterpart of the extremely low-lying filament. We suggestthat orphan penumbrae are formed in very narrow PILs of compact ARs and are thephotospheric manifestation of flux ropes in the photosphere.

An active region filament studied simultaneously in the chromosphere and photosphere: I - Magnetic structure