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| Titel |
Three-dimensional simulations of turbulent spectra in the local interstellar medium |
| VerfasserIn |
D. Shaikh, G. P. Zank |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 14, no. 4 ; Nr. 14, no. 4 (2007-07-06), S.351-359 |
| Datensatznummer |
250012235
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| Publikation (Nr.) |
 copernicus.org/npg-14-351-2007.pdf |
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| Zusammenfassung |
| Three-dimensional time dependent numerical simulations of compressible
magnetohydrodynamic fluids describing super-Alfvénic, supersonic and
strongly magnetized space and laboratory plasmas show a nonlinear
relaxation towards a state of near incompressibility. The latter is
characterized essentially by a subsonic turbulent Mach number. This
transition is mediated dynamically by disparate spectral energy
dissipation rates in compressible magnetosonic and shear Alfvénic
modes. Nonlinear cascades lead to super-Alfvénic turbulent motions
decaying to a sub-Alfvénic regime that couples weakly with
(magneto)acoustic cascades. Consequently, the supersonic plasma motion
is transformed into highly subsonic motion and density fluctuations
experience a passive convection. This model provides a self-consistent
explaination of the ubiquitous nature of incompressible magnetoplasma
fluctuations in the solar wind and the interstellar medium. |
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