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During 2017, when the Sun was moving toward the minimum phase of solar cycle24, an exceptionally eruptive active region (AR) NOAA 12673 emerged on the Sunduring August 28-September 10. During the highest activity level, the AR turnedinto a delta-type sunspot region, which manifests the most complexconfiguration of magnetic fields from the photosphere to the coronal heights.The AR 12673 produced four X-class and 27 M-class flares, along with numerousC-class flares, making it one of the most powerful ARs of solar cycle 24.Notably, it produced the largest flare of solar cycle 24, namely, the X9.3event on 2017 September 6. In this work, we highlight the results of ourcomprehensive analysis involving multi-wavelength imaging and coronal magneticfield modeling to understand the evolution and eruptivity from AR 12673. Weespecially focus on the morphological, spectral and kinematical evolution ofthe two X-class flares on 6 September 2017. We explore various large- andsmall-scale magnetic field structures of the active region which are associatedwith the triggering and subsequent outbursts during the powerful solartransients.

Origin of extreme solar eruptive activity from the active region NOAA 12673 and the largest flare of solar cycle 24