SD0/AIA composite image of 211 Å, 193 Å, and 171 Å at 01:26 UT superimposed on a SDO/HMI image at 01:30 UT on the day of the event. In the latter, magenta and blue correspond to magnetic fields with positive and negative polarity, respectively. The prominence and its overlying cavity as well as the polarity inversion line (PIL) where the prominence presumably lies are indicated by arrows. The white circle denotes the region where post-eruptive loops form at a later time after eruption.