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- W2952534447 abstract "The dynamics of the radial envelope of a weak coherent drift wave is approximately governed by a nonlinear Schrodinger equation, which emerges as a limit of the modified Hasegawa-Mima equation. The nonlinear Schrodinger equation has well-known soliton solutions, and its modulational instability can naturally generate solitary structures. In this paper, we demonstrate that this simple model can adequately describe the formation of solitary zonal structures in the modified Hasegawa-Mima equation, but only when the amplitude of the coherent drift wave is relatively small. At larger amplitudes, the modulational instability produces stationary zonal structures instead. Furthermore, we find that incoherent drift waves with beam-like spectra can also be modulationally unstable to the formation of solitary or stationary zonal structures, depending on the beam intensity. Notably, we show that these drift waves can be modeled as quantumlike particles (driftons) within a recently developed phase-space (Wigner-Moyal) formulation, which intuitively depicts the solitary zonal structures as quasi-monochromatic drifton condensates. Quantumlike effects, such as diffraction, are essential to these condensates; hence, the latter cannot be described by wave-kinetic models that are based on the ray approximation." @default.
- W2952534447 created "2019-06-27" @default.
- W2952534447 creator A5007662994 @default.
- W2952534447 creator A5060460874 @default.
- W2952534447 creator A5063459332 @default.
- W2952534447 date "2019-05-23" @default.
- W2952534447 modified "2023-09-25" @default.
- W2952534447 title "Formation of solitary zonal structures via the modulational instability of drift waves" @default.
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- W2952534447 doi "https://doi.org/10.1088/1361-6587/ab16a8" @default.
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