Above the weak nonlinearity: super-nonlinear waves in astrophysical and laboratory plasmas

Дубинов, А. Е.; Kolotkov, Dmitrii Y.

doi:10.1007/s41614-018-0014-9

Cited by 48 publications

(20 citation statements)

References 125 publications

(115 reference statements)

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“…However, non-linear behavior of the wave would also result in nonsinusoidal variation of the intensity, density and temperature. This would result in the detection of higher harmonics in the signal (Dubinov & Kolotkov 2018), but this is not seen in our observations.…”

Section: Non-linearitycontrasting

confidence: 67%

Quasi-periodic pulsations in a solar flare with an unusual phase shift

Kupriyanova

Kashapova

Doorsselaere

et al. 2018

Monthly Notices of the Royal Astronomical Society

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Two kinds of processes could occur during the flare decay phase: processes of energy release or processes of energy relaxation. Quasi-periodic pulsations (QPPs) of the broadband emission are a good tool for the verification of mechanisms. We aim to study the processes during the decay phase of the X-class solar flare SOL2014-03-29T17:48. The observations in X-ray, microwave, and extreme ultraviolet (EUV) bands are exploited to study the fine temporal, spatial, and spectral structures of the flare. The periods, amplitudes, and phases of both the fluxes and physical parameters (emission measure, temperature) are studied using standard methods of correlation, Fourier, and wavelet analyses. It is found that the source of the QPPs is associated with the uniform post-flare loop. The X-ray source is located at the top of the arcade. QPPs with the similar characteristic time scales of P ≈ 74-80 s are found in the X-ray (3-25 keV) and microwave (15.7 GHz) emissions. Besides, QPPs with the same period are found in the time profiles of both the temperature (T e ) and emission measure (E M). The QPPs in temperature and the QPPs in emission measure demonstrate anti-phase behavior. The analysis reveals the quasi-periodic process of energy relaxation, without any additional source of energy during the decay phase. The periods of the QPPs are in a good agreement with second harmonic of standing slow magneto-acoustic wave in the arcade which could be triggered by a Moreton wave initiated by the flare in the direct vicinity of the arcade.

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Section: Non-linearitycontrasting

confidence: 67%

Quasi-periodic pulsations in a solar flare with an unusual phase shift

Kupriyanova

Kashapova

Doorsselaere

et al. 2018

Monthly Notices of the Royal Astronomical Society

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“…С другой стороны, треугольные сигналы могут являться как результатом суперпозиции нескольких мод (рис. 5 и ), так и свидетельствовать о нелинейных процессах во вспышечной плазме [Dubinov, Kolotkov, 2018]. Мультипериодические КПП могут служить хорошим инструментом диагностики плазмы Guo et al, 2016].…”

Section: виды кппunclassified

Quasi-periodic pulsations in solar and stellar flares. Review

Kupriyanova

Kolotkov

Nakariakov

et al. 2020

Solnechno-Zemnaya Fizika

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This paper provides an overview of the state-of-the-art studies of oscillatory processes in solar and stellar flares, based on modern observational data from ground-based and space-borne instruments with high temporal, spatial, and spectral resolution in different electro-magnetic spectrum ranges. We examine the mechanisms that generate flare emission and its quasi-periodic modulation. We discuss similarities and differences between solar and stellar flares, and address associated problems of superflares on the Sun and space weather problems. Quasi-periodic pulsations (QPPs) of flare radiation are shown to be an effective tool for diagnosing both the flare processes themselves and the parameters of flare plasma and accelerated particles. We consider types of QPPs, their statistical properties, and methods of analysis, taking into account the non-stationarity of the QPPs’ parameters. We review the proposed mechanisms of QPPs and address open questions.

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“…Recently, a new wave structure called supernonlinear wave was introduced in theoretical [16] and astrophysical plasmas [17]. e nonlinear Alfvén waves and solitons defined in the framework of derivative nonlinear Schrodinger equation [18] are found to support supernonlinear waves.…”

Section: Introductionmentioning

confidence: 99%

Dynamical Complexity and Multistability in a Novel Lunar Wake Plasma System

Prasad

Mukherjee²,

Saha

et al. 2020

Complexity

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Dynamical complexity and multistability of electrostatic waves are investigated in a four-component homogeneous and magnetized lunar wake plasma constituting of beam electrons, heavier ions (alpha particles, He ++ ), protons, and suprathermal electrons. e unperturbed dynamical system of the considered lunar wake plasma supports nonlinear and supernonlinear trajectories which correspond to nonlinear and supernonlinear electrostatic waves. On the contrary, the perturbed dynamical system of lunar wake plasma shows different types of coexisting attractors including periodic, quasiperiodic, and chaotic, investigated by phase plots and Lyapunov exponents. To confirm chaotic and nonchaotic dynamics in the perturbed lunar wake plasma, 0 − 1 chaos test is performed. Furthermore, a weighted recurrence-based entropy is implemented to investigate the dynamical complexity of the system. Numerical results show existence of chaos with variation of complexity in the perturbed dynamics.

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Above the weak nonlinearity: super-nonlinear waves in astrophysical and laboratory plasmas

Cited by 48 publications

References 125 publications

Quasi-periodic pulsations in a solar flare with an unusual phase shift

Quasi-periodic pulsations in a solar flare with an unusual phase shift

Quasi-periodic pulsations in solar and stellar flares. Review

Dynamical Complexity and Multistability in a Novel Lunar Wake Plasma System

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