Solar Wind Measurements of the Alignment Between Vector Velocity and Magnetic Field Fluctuations and Comparisons to Boldyrev's Phenomenological Theory

Details Solar Wind Measurements of the Alignment Between Vector Velocity and Magnetic Field Fluctuations and Comparisons to Boldyrev's Phenomenological Theory Solar Wind Measurements of the Alignment Between Vector Velocity and Magnetic Field Fluctuations and Comparisons to Boldyrev's Phenomenological Theory

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh32b..05p&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH32B-05

Mathematics

Logic

2149 Mhd Waves And Turbulence (2752, 6050, 7836), 4475 Scaling: Spatial And Temporal (1872, 3270, 4277), 4490 Turbulence (3379, 4568, 7863), 7839 Nonlinear Phenomena (4400, 6944), 7863 Turbulence (4490)

Scientific paper

Boldyrev's phenomenological theory of incompressible MHD turbulence predicts that as energy cascades from large to small scales through the inertial range the components of velocity and magnetic field fluctuations perpendicular to the mean magnetic field become progressively more aligned with each other so that the angle between them decreases monotonically like λ1/4, where λ is the length scale of the fluctuations perpendicular to the mean magnetic field. Studies undertaken to search for this scaling law in solar wind data have shown that such a scaling law holds at the largest inertial range scales but then breaks down at intermediate to small scales. Analysis of data from the Wind spacecraft at 1 AU show a power law scaling exists from roughly 5× 104 to 103 seconds with a power law exponent similar to the predicted value 1/4. The scaling law disappears at smaller scales with the alignment angle reaching a minimum between 103 and 102 seconds and then increasing as the scale size decreases further down to 10 seconds or so.

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