Investigation of the X1.6 Flare Occurred in the Great Active Region 12192

The X1.6 flare observed on 22 October 2014 (SOL2014-10-22T14:28) was among the strongest flares occurred in the magnetically complex, great active region NOAA 12192. It was a confined flare, without an accompanying CME, despite the large amount of released energy. Here, we report on full spectro-polarimetric observations acquired by the IBIS/DST instrument along the Ca II 8542 line, analyzing the polarization signatures during the flare, together with complementary data from SDO and IRIS. We attempt to derive new information about the chromospheric magnetic field topology, which can help to explain the lack of ejecta.