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Turbulence and Microprocesses in Inhomogeneous Solar Wind Plasmas

1
Laboratoire de Physique des Plasmas, Centre National de la Recherche Scientifique, Ecole Polytechnique, Sorbonne Université, Université Paris-Saclay, Observatoire de Paris, PSL Research University, 91128 Palaiseau, France
2
Space Research Institute, 84/32 Profsoyuznaya Str., 117997 Moscow, Russia
3
Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Troitsk, 142190 Moscow, Russia
*
Author to whom correspondence should be addressed.
Fluids 2019, 4(2), 69; https://doi.org/10.3390/fluids4020069
Received: 9 February 2019 / Revised: 27 March 2019 / Accepted: 6 April 2019 / Published: 11 April 2019
(This article belongs to the Special Issue Modelling of Plasma Flow)
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Abstract

The random density fluctuations observed in the solar wind plasma crucially influence on the Langmuir wave turbulence generated by energetic electron beams ejected during solar bursts. Those are powerful phenomena consisting of a chain of successive processes leading ultimately to strong electromagnetic emissions. The small-scale processes governing the interactions between the waves, the beams and the inhomogeneous plasmas need to be studied to explain such macroscopic phenomena. Moreover, the complexity induced by the plasma irregularities requires to find new approaches and modelling. Therefore theoretical and numerical tools were built to describe the Langmuir wave turbulence and the beam’s dynamics in inhomogeneous plasmas, in the form of a self-consistent Hamiltonian model including a fluid description for the plasma and a kinetic approach for the beam. On this basis, numerical simulations were performed in order to shed light on the impact of the density fluctuations on the beam dynamics, the electromagnetic wave radiation, the generation of Langmuir wave turbulence, the waves’ coupling and decay phenomena involving Langmuir and low frequency waves, the acceleration of beam electrons, their diffusion mechanisms, the modulation of the Langmuir waveforms and the statistical properties of the radiated fields’ distributions. The paper presents the main results obtained in the form of a review. View Full-Text
Keywords: electron beam; electromagnetic wave radiation; Langmuir wave turbulence; inhomogeneous plasmas; solar wind; wave-particle interaction; resonant wave decay; particle acceleration; wave diffusion; Hamiltonian system electron beam; electromagnetic wave radiation; Langmuir wave turbulence; inhomogeneous plasmas; solar wind; wave-particle interaction; resonant wave decay; particle acceleration; wave diffusion; Hamiltonian system
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Krafft, C.; Volokitin, A.S.; Gauthier, G. Turbulence and Microprocesses in Inhomogeneous Solar Wind Plasmas. Fluids 2019, 4, 69.

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