Dissipation range spectral characteristics at 1 AU

We have created a data base of over 800 interplanetary magnetic field spectra recorded by the ACE spacecraft. The primary purpose for creating this data base was to study the spectral characteristics of the dissipation range at 1 AU and contrast these observations with the properties of the more familiar inertial range. The data base was constructed to span a wide range of parameter space including magnetic clouds and open field lines with a broad range of bulk plasma parameters (IMF intensity, proton beta, etc.). While we corroborate the earlier results of Leamon et al. [1998a,b; 2000], we also find new results leading to a partial explanation for the form of the dissipation range spectrum. Specifically, we demonstate the the power law index for dissipation range fluctuations is controlled by the rate of energy cascade through the inertial range spectrum. This stands in stark contrast to the established results for Navier-Stokes fluids where the dissipation range possesses a universal form independent of the rate of energy dissipation.