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The magnetic Rayleigh-Taylor instability and flute waves at the ion Larmor radius scales
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- Onishchenko, O G (author)
- Institute Phys Earth, Moscow
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- Pokhotelov, O A (author)
- Institute Phys Earth, Moscow
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- Stenflo, Lennart (author)
- Linköpings universitet,Teoretisk Fysik,Tekniska högskolan
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- American Institute of Physics, 2011
- 2011
- English.
- In: PHYSICS OF PLASMAS. - : American Institute of Physics. - 1070-664X .- 1089-7674. ; 18:2, s. 022106-
- Journal article (peer-reviewed)
Abstract
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- The theory of flute waves (with arbitrary spatial scales compared to the ion Larmor radius) driven by the Rayleigh-Taylor instability (RTI) is developed. Both the kinetic and hydrodynamic models are considered. In this way we have extended the previous analysis of RTI carried out in the long wavelength limit. It is found that complete finite ion Larmor radius stabilization is absent when the ion diamagnetic velocity attains the ion gravitation drift velocity. The hydrodynamic approach allowed us to deduce a new set of nonlinear equations for flute waves with arbitrary spatial scales. It is shown that the previously deduced equations are inadequate when the wavelength becomes of the order of the ion Larmor radius. In the linear limit a Fourier transform of these equations yields the dispersion relation which in the so-called Pade approximation corresponds to the results of the fully kinetic treatment. The development of such a theory gives us enough grounds for an adequate description of the RTI stabilization by the finite ion Larmor radius effect.
Keyword
- TECHNOLOGY
- TEKNIKVETENSKAP
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- Pokhotelov, O A
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