One-Minute Quasi-Periodic Pulsations Seen in a Solar Flare

Abstract

We study quasi-periodic pulsations (QPPs) in the SOL2014-09-10 event that was detected by the Geostationary Operational Environmental Satellites (GOES), the Atmospheric Imaging Assembly (AIA) and the Extreme Ultraviolet Variability Experiment (EVE) onboard the Solar Dynamics Observatory (SDO), and the Gamma Ray Burst Monitor (GBM) onboard the Fermi satellite. Previous studies have found that this flare displays four-minute QPPs in a broad range of wavelengths. In this article, we find that this event also shows QPPs with a period of around one minute. Using the Fast Fourier Transform (FFT) method, the light curves are decomposed into fast- and slowly varying components with a separation at \({\approx}\,100~\mbox{seconds}\). The four-minute QPPs are in the slowly varying component, and the one-minute QPPs are identified with the fast-varying components in the impulsive and maximum phases. Similarly as the four-minute QPPs, the one-minute QPPs are simultaneously found in soft X-rays (SXR), extreme ultraviolet (EUV), and hard X-ray (HXR) emission. High correlations are found between the fast-varying components at the different wavelengths, especially between SXR and HXR. The spatial location of the sources of one-minute QPPs differ from those of the four-minute QPPs. The four-minute QPPs appear in the whole flare region, while the one-minute QPPs tend to originate from the flare loop footpoints. This finding provides an observational constraint for the physical origin of the QPPs.