Case Studies of Photospheric Magnetic Field Properties of Active Regions Associated with X-class Solar Flares

Solar flares are a transient phenomenon occurred in the active region (AR) on Sun’s surface, producing intense emissions EUV and soft X-ray that can wreak havoc near-Earth space mission satellite as well radio-based communication navigation. The ARs accompanied with strong magnetic fields manifested dark spots photosphere. To understand photospheric field properties of produce flares, two associated X-class namely AR 12192 12297, respectively 25 October 2014 11 March 2015, studied terms classification various physical parameters. images from Langkawi National Observatory (LNO) parameters Space-weather HMI Active Region Patches (SHARP) used this study. A total seven SHARP examined which calculated sums quantities have been identified useful predictors for flare forecast. These classified βγδ sunspots whereas their formation size quite different each other. Our results showed intensity has little relationship area an free energy; temporal variation individual parameter no obvious consistent pre-flare feature. It is concluded may not be predicting onset time flare.