Extreme-ultraviolet Wave and Quasiperiodic Pulsations during an Eruptive M-class Flare

Abstract In this paper, we report multiwavelength and multipoint observations of the prominence eruption originating from active region 11163, which generated an M3.5 class flare and a coronal mass ejection (CME) on 2011 February 24. The prominence lifts off and propagates nonradially in the southeast direction. Using the revised cone model, we carry out three-dimensional reconstructions of the ice-cream-like prominence. It is found that the latitudinal inclination angle decreases from ∼60° to ∼37°, indicating that the prominence tends to propagate more radially. The longitudinal inclination angle almost keeps constant (−6°). The highly inclined prominence eruption and the related CME drive an extreme-ultraviolet (EUV) wave, which propagates southward at speeds of ∼381.60 and ∼398.59 km s −1 observed in 193 and 304 Å, respectively. The M3.5 class flare presents quasiperiodic pulsations (QPPs) in soft X-ray, hard X-ray, EUV, and radio wavelengths with periods of 80−120 s. Contemporary with the flare QPPs, a thin current sheet and multiple plasmoids are observed following the eruptive prominence. Combining with the appearance of drifting pulsation structure, the QPPs are most probably generated by quasiperiodic magnetic reconnection and particle accelerations as a result of plasmoids in the current sheet.