A Compact Source for Quasi-Periodic Pulsation in an M-class Solar Flare

Abstract

Quasi-periodic pulsations (QPP) are usually found in the light curves of solar and stellar flares, they carry the features of time characteristics and plasma emission of the flaring core, and could be used to diagnose the coronas of the Sun and remote stars. In this study, we combined the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory and the Nobeyama Radioheliograph (NoRH) to observe an M7.7 class flare occurred at active region 11520 on 19 July 2012. A QPP was detected both in the AIA $131\unit{Å}$ bandpass and the NoRH $17\unit{GHz}$ channel, it had a period of about four minutes. In the spatial distribution of Fourier power, we found that this QPP originated from a compact source and that it overlapped with the X-ray source above the loop top. The plasma emission intensities in the AIA $131\unit{Å}$ bandpass were highly correlated within this region. The source region is further segmented into stripes that oscillated with distinctive phases. Evidence in this event suggests that this QPP was likely to be generated by intermittent energy injection into the reconnection region.

4 figures, accepted for ApJ Letter

References in corpus (15)

• Quasi-periodic pulsations in solar and stellar flares: an overview of recent results
• Nonlinear Fast Magnetoacoustic Wave Propagation in the Neighbourhood of a 2D magnetic X-point: Oscillatory Reconnection
• Above-the-loop-top Oscillation and Quasi-periodic Coronal Wave Generation in Solar Flares
• Soft X-ray Pulsations in Solar Flares
• Quasi-periodic pulsations in solar and stellar flares: re-evaluating their nature in the context of power-law flare Fourier spectra
• Three-dimensional oscillatory magnetic reconnection
• Persistent Quasi-Periodic Pulsations During a Large X-Class Solar Flare
• X-ray and EUV Observations of Simultaneous Short and Long Period Oscillations in Hot Coronal Arcade Loops
• Generation of quasi-periodic waves and flows in the solar atmosphere by oscillatory reconnection
• SDO/AIA Observations of a Reflecting Longitudinal Wave in a Coronal Loop
• Broadband Quasi-Periodic Radio and X-ray Pulsations in a Solar Flare
• Forward Modelling of Standing Slow Modes in Flaring Coronal Loops
• Differential emission measure Analysis of a limb solar flare on 2012 July 19
• Forward Modeling of SDO/AIA and X-Ray Emission from a Simulated Flux Rope Ejection
• Scaling laws of quasi-periodic pulsations in solar flares

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• Oscillatory Reconnection of a 2D X-point in a hot coronal plasma
• Detections of Multi-Periodic Oscillations during a Circular Ribbon Flare
• Estimating red noise in quasi-periodic signals with MCMC-based Bayesian
• Localizing quasi-periodic pulsations in hard X-ray, microwave and Lya emissions of an X6.4 Flare
• Localizing short-period pulsations in hard X-rays and Gamma-rays during an X9.0 flare
• Do Periods of Decayless Kink Oscillations of Solar Coronal Loops Depend on Noise?
• Multiple Regions of Nonthermal Quasi-Periodic Pulsations during the Impulsive Phase of a Solar Flare
• Very long-periodic pulsations detected simultaneously in a white-light flare and sunspot penumbra
• The independence of oscillatory reconnection periodicity from the initial pulse
• Quasi-Periodic Pulsations Detected in Ly$\alpha$ and Nonthermal Emissions During Solar Flares