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3 results

  • 7 - Interactions and Dissipation of Internal Waves and the Vortical Mode

  • Michael C. Gregg, University of Washington
  • Book:
    Ocean Mixing
    Published online:
    10 March 2021
    Print publication:
    04 February 2021, pp 230-282

  • Summary

    This chapter discusses the interactions generating and dissipating internal waves, the primary mechanism mixing the stratified ocean. Generation is primarily by wind stress at the surface, bottom stress at the seafloor, and tidal flows over irregular bottoms. Energy is transferred from large to small scales by resonant interactions, primary triads, that lead to ultimate breaking and mixing. Testing of expressions for predicting dissipation rates resulting from wave–wave interactions is examined in detail. The mechanisms of breaking affect the efficiency of mixing and therefore the buoyancy fluxes it produces. Shear instabilities and advective overturning are the two primary mechanisms, but the form of instability remains open to question. Finally, the saturated range separating linear internal waves from turbulence is examined.

  • Conditions for the existence of Kelvin-Helmholtz instability in a CME

  • Andrés Páez, Vera Jatenco-Pereira, Diego Falceta-Gonçcalves, Merav Opher
  • Journal:
    Proceedings of the International Astronomical Union / Volume 11 / Issue S320 / August 2015
    Published online by Cambridge University Press:
    09 September 2016, pp. 218-220
    Print publication:
    August 2015
    • Article
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  • The presence of Kelvin-Helmholtz instability (KHI) in the sheaths of Coronal Mass Ejections (CMEs) has been proposed and observed by several authors in the literature. In the present work, we assume their existence and propose a method to constrain the local properties, like the CME magnetic field intensity for the development of KHI. We study a CME in the initiation phase interacting with the slow solar wind (Zone I) and with the fast solar wind (Zone II). Based on the theory of magnetic KHI proposed by Chandrasekhar (1961) we found the radial heliocentric interval for the KHI existence, in particular we constrain it with the CME magnetic field intensity. We conclude that KHI may exist in both CME Zones but it is perceived that Zone I is more appropriated for the KHI formation.

  • Kelvin-Helmholtz instability in MHD flows

  • A. H. Khater, D. K. Callebaut, A. R. Seadawy
  • Journal:
    Proceedings of the International Astronomical Union / Volume 2 / Issue S233 / March 2006
    Published online by Cambridge University Press:
    01 November 2006, pp. 313-315
    Print publication:
    March 2006
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  • The Kelvin-Helmholtz instability (KHI) could be a potential source for some of the Alfvénic fluctuations observed in the solar wind. The nonlinear evolution of KHI is examined in 2+1 dimensions in the context of magnetohydrodynamics. We derived a nonlinear Schródinger equation (NLSE) and we obtained soliton solutions of this 2+1 dimensions NLSE.