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Solar Active Region (AR) 12673 is the most flare productive AR in the solarcycle 24. It produced four X-class flares including the X9.3 flare on 06September 2017 and the X8.2 limb event on 10 September. Sun and Norton (2017)reported that this region had an unusual high rate of flux emergence, whileHuang et al. (2018) reported that the X9.3 flare had extremely strongwhite-light flare emissions. Yang at al. (2017) described the detailedmorphological evolution of this AR. In this report, we focus on usual behaviorsof the light bridge (LB) dividing the delta configuration of this AR, namelythe strong magnetic fields (above 5500 G) in the LB and apparent photospherictwist as shown in observations with a 0.1 arcsec spatial resolution obtained bythe 1.6m telescope at Big Bear Solar Observatory.

Strong Transverse Photosphere Magnetic Fields and Twist in Light Bridge Dividing Delta Sunspot of Active Region 12673