Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh51b..06t&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SH51B-06
Physics
2134 Interplanetary Magnetic Fields, 2149 Mhd Waves And Turbulence (2752, 6050, 7836), 2159 Plasma Waves And Turbulence
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. With this hypothesis several hybrid model for interplanetary turbulence have been proposed 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 observable spectral index of MHD turbulence that derive, in many cases, from different views of the coupling of MHD waves to the turbulence. We call particular attention to the Goldreich and Shridhar model that predicts a -2 power law spectrum for observed wave vectors parallel to the mean magnetic field as well as the Boldyrev prediction of -3/2 spectral indexes. We examine ACE observations of magnetic field and velocity measurements at 1AU along and Helios observations of the magnetic field inside 1 AU. We use inertial range measurements in several frequency ranges. We examine how the spectral form of computed power spectra depends on the angle between the mean field and the flow.
Borovsky Joseph
Forman Miriam A.
Matthaeus William H.
Smith Walter C.
Tessein Jeffrey A.
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