Authors: Yan Xu (NJIT), Chunhui Xu (NJIT), Ying Wang (NJIT), Haodi Jiang (SHSU), Aryiadna Yesmanchyk (NJIT), Jason T.L. Wang (NJIT), Haimin Wang (NJIT)

Vector magnetograms reveal 3D configuration of the magnetic field rather than just its line-of-sight  (LOS) component. Thus vector magnetograms can be used to calculate critical parameters, such as magnetic helicity and free energy, for understanding solar eruptive events and hence space weather forecasting. Consistent vector magnetograms have been provided by SDO/HMI since 2010. In order to achieve better flare prediction, more violent events in Solar Cycle (SC) 23 should be considered, because SC 23 was a stronger cycle than SCs 24 and 25. Based on MDI LOS magnetograms and Hɑ images, AI models have been developed to generate synthetic vector magnetograms in SC 23. The accuracy and reliability of these AI  models are further established through out-of-sample validation, ensuring robust performance across varying solar conditions. Here, we demonstrate the practical utility of the AI models   through the creation of synthetic MDI vector fields during the 2003 Halloween events, providing critical insights into some of the most intense solar activity on record.