Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh23a1145t&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH23A-1145
Other
2134 Interplanetary Magnetic Fields, 2149 Mhd Waves And Turbulence (2752, 6050, 7836), 2159 Plasma Waves And Turbulence, 2164 Solar Wind Plasma
Scientific paper
The mean interplanetary magnetic field (IMF) is thought to provide a direction that breaks the isotropic symmetry of turbulence by providing a preferred direction. Other authors have explored how the resulting axisymmetric turbulence may be described and evolves, but to date only a single form of axisymmetry has been discussed in detail: The preferential orientation of the wave vector perpendicular to the mean IMF. With this observation there comes a hybrid model for interplanetary turbulence where field-aligned wave vectors are coupled to perpendicular wave vectors and the resultant system evolves as a coupled two-component turbulent geometry. However, asymmetry can take on many forms and there are numerous predictions for the spectral index of MHD turbulence. The spectral index of the fluctuation spectrum has significant implications for the underlying dynamics and the rate of energy trasport through the spectrum. We examine ACE observations of magnetic field, velocity, density, and temperature measurements at 1 AU and ask if the spectral form of field-aligned wave vectors is similar to that of the perpendicular component. The measurements we use are at scales corresponding to the inertial range, but a better understanding of these scales will illuminate the manner in which the dissipation range is driven.
Borovsky Joseph E.
Smith Walter C.
Tessein Jeffrey A.
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