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Multi-mode quasi-periodic pulsations in a solar flare View all abstracts by submitter

Valery Nakariakov   Submitted: 2014-12-18 09:53

Context. Quasi-periodic pulsations (QPP) of the electromagnetic radiation emitted in solar and stellar flares are often detected in microwave, white light, X-ray and gamma-ray bands. Mechanisms for QPP are intensively debated in the literature. Previous studies revealed that QPP may manifest nonlinear, non-stationary and, perhaps, multi-modal processes operating in flares. Aims. We study QPP of the microwave emission generated in an X3.2-class solar flare on 14 May, 2013, observed with the Nobeyama Radioheliograph (NoRH), aiming to reveal signatures of the nonlinear, non-stationary, and multi-modal processes in the signal. Methods. The NoRH correlation signal obtained at the 17 GHz intensity has a clear QPP pattern. The signal was analysed with the Hilbert?Huang transform (HHT) that allows one to determine its instant amplitude and frequency, and their time variation. Results. It was established that the QPP consists of at least three well-defined intrinsic modes, with the mean periods of 15, 45 and 100 seconds. All the modes have quasi-harmonic behaviour with different modulation patterns. The 100-second intrinsic mode is a decaying oscillation, with the decay time of 250 seconds. The 15-second intrinsic mode shows a similar behaviour, with the decay time of 90 seconds. The 45-s mode has a wave-train behaviour. Conclusions. Dynamical properties of detected intrinsic modes indicate that the 100-s and 15-s modes are likely to be associated with fundamental kink and sausage modes of the flaring loop, respectively. The 100-s oscillation could also be caused by the fundamental longitudinal mode,while this interpretation requires the plasma temperature of about 30 million K and hence is not likely. The 45-s mode could be the second standing harmonics of the kink mode.

Authors: Kolotkov, D. Y., Nakariakov, V. M., Kupriyanova, E. G., Ratcliffe, H., Shibasaki, K.
Projects: Nobeyama Radioheliograph

Publication Status: A&A, accepted
Last Modified: 2014-12-21 19:19
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