Turbulent Cascade Rates in the Upper Inertial Range

Details Turbulent Cascade Rates in the Upper Inertial Range Turbulent Cascade Rates in the Upper Inertial Range

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh11b..05h&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH11B-05

Physics

2134 Interplanetary Magnetic Fields, 2149 Mhd Waves And Turbulence (2752, 6050, 7836), 7839 Nonlinear Phenomena (4400, 6944), 7863 Turbulence (4490)

Scientific paper

We have constructed a data base from ACE spacecraft measurements of solar wind magnetic field fluctuations at the high end of the inertial range near 1 AU. Using magnetic field measurements outside of magnetic clouds in combination with plasma measurements, we have evaluated expressions for the Kolmogorov and Kraichnan cascade rates at 0.01 Hz from magnetic field power spectra. We have examined these rates as a function of proton temperature and solar wind speed and have compared them to the expected rate based on the heating of protons at 1 AU. We find that the average Kolmogorov rate is consistently more than a factor of 10 greater than expected. We conclude that the cascade rate cannot be estimated using a Kolmogorov prescription and power spectra. The Kraichnan rate is close to the expected rate and is potentially a valid way to estimate the cascade rate.

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