Spatial evolution of the magnetic field spectral exponent in the solar wind: Helios and Ulysses comparison

Physics – Plasma Physics

Scientific paper

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Solar Physics, Astrophysics, And Astronomy: Coronal Holes, Interplanetary Physics: Mhd Waves And Turbulence, Space Plasma Physics: Turbulence

Scientific paper

The spatial evolution of the spectral exponent of magnetic field fluctuations in the solar wind is investigated by a comparison of spectra and length functions obtained from Helios for in-ecliptic and from Ulysses for high-latitude observations. A similar radial evolution trend is found in both data sets for the Bz component of the magnetic field, which is least affected by compressive interactions. Yet the fluctuations seem to evolve more slowly in the polar flows as compared with the Alfvénic fluctuations found by the Helios experiments in coronal-hole-related flows near the Sun in the ecliptic plane.

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