Abstract
This chapter focuses on the scale-dependent anisotropy of magnetic fluctuation in the earth's plasma sheet. The high resolution magnetic field data is used from the Cluster spacecraft to analyze the occurrence of the specific anisotropy characteristics of magnetic fluctuations at two adjacent scales near the dissipation scale, during non-flow and bursty-bulk flow (BBF) associated periods. The obtained anisotropy patterns show signatures of scale dependent anisotropy and can be explained by different physical processes. During non-flow periods the main source of the magnetic anisotropy are anisotropic ion populations within the plasma sheet boundary layer (PSBL). BBF-associated periods are characterized mainly by strong interaction of the plasma flow with the magnetic field. In both cases, the local mean background magnetic field has a decisive role in the development of anisotropy in magnetic fluctuations.
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