Abstract
The review summarises recent theoretical achievements and observational manifestations of a new, recently discovered type of nonlinear oscillations in multi-component plasmas, namely super-nonlinear periodic waves and super-nonlinear solitary waves (supersolitons). Both are characterised by a non-trivial topology of their phase portraits, highly anharmonic profile shapes, extremely long periods, and large amplitudes. Based upon multi-fluid magnetohydrodynamic plasma models, examples of ion-acoustic and Alfvén super-nonlinear waves are considered. A multi-component nature of the plasma was revealed to be a crucial condition for the existence of these super-nonlinear waves, with the complexity of the system growing with the number of plasma species accounted for in the model. A minimum number of plasma components which allow for the existence of super-nonlinear waves are also discussed. From the observational point of view, typical signatures of periodic super-nonlinear waves are manifested, for example, in the oscillatory processes operating in the magnetised plasma of the solar corona and ground-based plasma machines. Super-nonlinear solitary structures (supersolitons) of an electrostatic origin are recognised in the Earth’s magnetosphere, laboratory experiments with chemically active plasmas, and numerical simulations.
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Acknowledgements
The authors are grateful to Prof. Valery Nakariakov and Prof. George Rowlands for valuable discussions and constructive comments. D.Y. Kolotkov acknowledges the support of the STFC consolidated grant ST/L000733/1. A. E. Dubinov worked in the framework of the Program of Increasing the Competitiveness of NRNU MEPhI.
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Dubinov, A.E., Kolotkov, D.Y. Above the weak nonlinearity: super-nonlinear waves in astrophysical and laboratory plasmas. Rev. Mod. Plasma Phys. 2, 2 (2018). https://doi.org/10.1007/s41614-018-0014-9
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DOI: https://doi.org/10.1007/s41614-018-0014-9