We investigate triggering , activation , and ejection of a solar eruptive prominence that occurred in a multi-polar flux system of active region NOAA 11548 on 2012 August 18 by analyzing data from AIA on board SDO , RHESSI , and EUVI/SECCHI on board STEREO .
Prior to the prominence activation , we observed striking coronal activities in the form of a blowout jet which is associated with rapid eruption of a cool flux rope .
Further , the jet-associated flux rope eruption underwent splitting and rotation during its outward expansion .
These coronal activities are followed by the prominence activation during which it slowly rises with a speed of \sim 12 km s ^ { -1 } while the region below the prominence emits gradually varying EUV and thermal X-ray emissions .
From these observations , we propose that the prominence eruption is a complex , multi-step phenomenon in which a combination of internal ( tether-cutting reconnection ) and external ( i.e. , pre-eruption coronal activities ) processes are involved .
The prominence underwent catastrophic loss of equilibrium with the onset of the impulsive phase of an M1.8 flare suggesting large-scale energy release by coronal magnetic reconnection .
We obtained signatures of particle acceleration in the form of power law spectra with hard electron spectral index ( \delta \sim 3 ) and strong HXR footpoint sources .
During the impulsive phase , a hot EUV plasmoid was observed below the apex of the erupting prominence that ejected in the direction of the prominence with a speed of \sim 177 km s ^ { -1 } .
The temporal , spatial and kinematic correlations between the erupting prominence and the plasmoid imply that the magnetic reconnection supported the fast ejection of prominence in the lower corona .