Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh11b..04m&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SH11B-04
Physics
2149 Mhd Waves And Turbulence, 2164 Solar Wind Plasma
Scientific paper
Observations and theory motivate models of solar wind fluctuations consisting of two components-- ``slab'' Alfven waves varying mainly parallel to the ambient dc magnetic field, and a zero-frequency quasi two-dimensional turbulent component varying mainly perpendicular to the magnetic field. We present an extension of the previous analysis, employing ACE plasma and magnetic field data, to examine three dimensional correlations and spectra for the cross helicity, velocity, magnetic and Elsasser fluctuations. We find surprisingly that all quantities have similar anisotropic structure, thus implying that the normalized cross helicity, a measure of the strength of the non-linear terms, is essentially isotropic. This conclusion stands in contrast to the usual assumption that the slab component, as propagating waves, carries most of the cross helicity. This calls for some revision in standard solar wind turbulence models.
Dasso Sergio
Matthaeus William H.
Milano Leonardo J.
Smith Walter C.
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