Structure and Dynamics of the Polar Crown Prominence Eruption on 2012 March 12

We will present the study of one polar crown prominence that erupted on 2012 March 12. This prominence is viewed at the east limb by SDO/AIA and displays a quasi vertical-thread structure. Bright U-shape (horn-like) structure is observed surrounding the upper portion of the prominence before the eruption and becomes more prominent during the eruption. When viewed on the disk, STEREO-B shows that this prominence is composed of series of vertical threads and displays a loop-like structure during the eruption. We focus on the magnetic support of the prominence by studying the structure and dynamics before and during the eruption using observations from SDO, Hinode, and STEREO. We found that the transition from slow rise to fast rise phase is associated with magnetic reconnection below rising prominence threads. We will also present analysis on the thermodynamics of the prominence. Preliminary DEM analysis shows prominence heating at the inner edge of the prominence arch during eruption. A decrease of column density of the prominence is also found during the eruption. This work is supported by NASA Grant (#NNX12AB25G) and a NASA Contract (#SP02H1701R) from LMSAL to SAO.