Observations of a quasi-periodic pulsation in the coronal loop and microwave flux during a solar preflare phase

Abstract

We report a quasi-periodic pulsation (QPP) event simultaneously detected from the spatial displacements of coronal loop at both EUV images and microwave emission during the preflare phase of a C1.1 flare on 2016 March 23. Using the motion magnification technique, a low-amplitude transverse oscillation with the growing period is discovered in a diffuse coronal loop in Atmospheric Imaging Assembly (AIA) image sequences at wavelength of 171 A, and the initial oscillation period is estimated to be ~397 s with a slow growth rate of 0.045. At the same time, a QPP with growing periods from roughly 300 s to nearly 500 s is discovered in the microwave flux in the same active region. Based on the imaging observations measured at EUV wavelengths by the AIA and at microwave 17 GHz by Nobeyama Radioheliograph, the diffuse coronal loop and the microwave radiation source are found to be connected through a hot loop seen in AIA images at wavelength of 94 A. The growing period of the QPP should be related to the modulation of LRC-circuit oscillating process in a current-carrying plasma loop. The existence of electric currents may imply the non-potentialities in the source region during the preflare phase.

arXiv comment13 pages, 4 figures, accepted by the ApJL

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• Transverse coronal loop oscillations excited by homologous circular-ribbon flares
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• Novel data analysis techniques in coronal seismology
• Observations of a Flare-ignited broad Quasi-periodic Fast-propagating wave train
• Simultaneous transverse oscillations of a coronal loop and a filament excited by a circular-ribbon flare
• Localizing quasi-periodic pulsations in hard X-ray, microwave and Lya emissions of an X6.4 Flare
• The early evolution of solar flaring plasma loops
• Imaging Preflare Broadband Pulsations in the Decimetric-metric Wavelengths