North-south anisotropy of cosmic rays in recurrent high-velocity streams of the solar wind

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Galactic Cosmic Rays, Interplanetary Magnetic Fields, Radiation Distribution, Solar Wind Velocity, Anisotropy, Coronal Holes, Diffusion Coefficient, Magnetic Field Configurations

Scientific paper

The N-S anisotropy of galactic cosmic rays in recurrent high-velocity streams of the solar wind is investigated on the basis of neutron-monitor data for 1973-1974. It is shown that the N-S anisotropy in streams connected with coronal holes is very small in the first 2-3 days the stream intersects the earth, but that afterward this anisotropy reaches a considerable magnitude. This behavior of the N-S anisotropy can be explained by the effect of plasma-flow nonradiality in the high-velocity stream and/or by the effect of the nonuniform distribution of magnetic-field irregularities in the direction of the stream cross section in the ecliptic plane. Also considered is the behavior of the Bz component of the IMF at the zero hour when the earth intersects the leading edge of the high-velocity stream.

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