Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh51b..07s&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SH51B-07
Physics
2149 Mhd Waves And Turbulence (2752, 6050, 7836), 2159 Plasma Waves And Turbulence, 2164 Solar Wind Plasma, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 7863 Turbulence (4490)
Scientific paper
Magnetohydrodynamic (MHD) turbulence evolves in response to a complex set of mechanical and electromagnetic stresses that drive couplings across spatial scale, leading to a cascade in which there is a net transfer of energy to small scales. Two important features of MHD turbulence, the production of spatial intermittency and the appearance of distinctive states associated with turbulent relaxation, have generally been studied independently. We show, by using decaying direct numerical simulations, that MHD turbulence generates coherent spatial correlations of several types. These are associated to the tendency of the system to develop local Beltrami fields. Moreover, a self-organization process produces anti-alignments in the magnetic and kinetic components of the acceleration. Each of these effects suppresses the nonlinearity to levels lower than the strengths obtained from "Gaussianized" fields. We conclude that this complex picture of correlations causes a local rapid cancellation of mechanical and electromagnetic forces, leading to a reduction of turbulent fluctuations. The result is the production of intermittent spatial patches. This provides first clues concerning the connection between relaxation processes and the generation of intermittent structures in laboratory and space plasmas.
Dmitruk Pablo
Matthaeus William
Servidio Sergio
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