Interplanetary Alfvenic fluctuations: A statistical study of the directional variations of the magnetic field

Physics

Scientific paper

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Interplanetary Magnetic Fields, Magnetic Field Configurations, Statistical Analysis, Helios 1, Helios 2, Magnetohydrodynamic Waves, Solar Wind, Sun

Scientific paper

Magnetic field data from Helios 1 and 2 were used to test a stochastic model for interplanetary Alfvenic fluctuations. A statistical analysis of the directional variations of the interplanetary field was performed for Alfvenic regions of the solar wind. The experimental distributions agree reasonably well with those predicted by theory. A rough estimate for the correlation length of the observed fluctuations was inferred. Findings in the near Earth region agree with previous determinations. A decrease of the correlation length approaching the Sun is found, essentially related to the observed enhancement in the angular variability of the magnetic field near the Sun.

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