Spectral anisotropy of solar wind turbulence in the inertial range and dissipation range

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Solar Wind, Magnetohydrodynamics, Magnetic Fields, Wave Equations, Particle Emission, Solar Wind, Magnetohydrodynamics And Plasmas, Electric And Magnetic Fields, Solar Magnetism, Solutions Of Wave Equations: Bound States

Scientific paper

Wavelet analysis is a tool that can simultaneously analyze spacecraft data in both time and frequency. This enables the magnetic energy spectrum (trace spectrum) to be measured for different angles between the local mean magnetic field B0 and the direction of the mean flow within a single data set. Examples obtained around solar minimum using Ulysses data at high latitudes and Stereo data for high-speed streams in the ecliptic plane show that the spectral exponent in the inertial range varies nearly monotonically from approximately 1.6 when B0 is perpendicular to the flow to 2.0 when B0 is parallel to the flow, roughly consistent with anisotropic theories of incompressible MHD turbulence. This and other new information about the 3D wavector spectrum of solar wind fluctuations in the inertial range and the dissipation range are briefly discussed.

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