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      Conditions for sustainment of magnetohydrodynamic turbulence driven by Alfvén waves

      Dmitruk, Pablo; Matthaeus, William H.; Milano, L. J.; Oughton, Sean
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      Conditions for sustainment.pdf
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      DOI
       10.1063/1.1344563
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      Dmitruk, P., Matthaeus, W. H., Milano, L. J., & Oughton, S. (2001). Conditions for sustainment of magnetohydrodynamic turbulence driven by Alfvén waves. Physics of Plasmas, 8, 2377.
      Permanent Research Commons link: https://hdl.handle.net/10289/8606
      Abstract
      In a number of space and astrophysical plasmas,turbulence is driven by the supply of wave energy. In the context of incompressible magnetohydrodynamics (MHD) there are basic physical reasons, associated with conservation of cross helicity, why this kind of driving may be ineffective in sustaining turbulence. Here an investigation is made into some basic requirements for sustaining steady turbulence and dissipation in the context of incompressible MHD in a weakly inhomogeneous open field line region, driven by the supply of unidirectionally propagating waves at a boundary. While such wave driving cannot alone sustain turbulence, the addition of reflection permits sustainment. Another sustainment issue is the action of the nonpropagating or quasi-two dimensional part of the spectrum; this is particularly important in setting up a steady cascade. Thus, details of the waveboundary conditions also affect the ease of sustaining a cascade. Supply of a broadband spectrum of waves can overcome the latter difficulty but not the former, that is, the need for reflections. Implications for coronal heating and other astrophysical applications, as well as simulations, are suggested.
      Date
      2001
      Type
      Journal Article
      Publisher
      American Institute of Physics
      Rights
      © 2001 American Institute of Physics
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      • Computing and Mathematical Sciences Papers [1455]
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