Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh51f..01s&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH51F-01
Physics
Plasma Physics
[4490] Nonlinear Geophysics / Turbulence, [7544] Solar Physics, Astrophysics, And Astronomy / Stellar Interiors And Dynamo Theory, [7839] Space Plasma Physics / Nonlinear Phenomena, [7863] Space Plasma Physics / Turbulence
Scientific paper
The statistical mechanics of Fourier models of ideal, homogeneous, incompressible magnetohydrodynamic (MHD) turbulence is discussed, along with their relevance for dissipative magnetofluids. Although statistical theory predicts that Fourier coefficients of fluid velocity and magnetic field are zero-mean random variables, numerical simulations clearly show that certain coefficients have a non-zero mean value that can be very large compared to the associated standard deviation, i.e., we have coherent structure. We use eigenanalysis of the modal covariance matrices in the probability density function to explain this phenomena in terms of `broken ergodicity', which is defined to occur when dynamical behavior does not match ensemble predictions on very long time-scales. We provide examples from 2-D and 3-D magnetohydrodynamic simulations of homogeneous turbulence, and show new results from long-time simulations of MHD turbulence with and without a mean magnetic field.
No associations
LandOfFree
Coherent eigenmodes in homogeneous MHD turbulence does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Coherent eigenmodes in homogeneous MHD turbulence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coherent eigenmodes in homogeneous MHD turbulence will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1512093