Directional anisotropy in cosmic-ray intensity

Physics

Scientific paper

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Cosmic Rays, Diurnal Variations, Magnetic Storms, Particle Flux Density, Anisotropy, Magnetic Effects, Particle Energy

Scientific paper

Preliminary results are presented for a study that was undertaken to determine the first and second E-W, N-S, S-E, and N-W diurnal harmonics of changes in cosmic-ray intensity. All the data were obtained during magnetic storms which occurred in the period from June 1971 to December 1973; the dependence of the diurnal variation in intensity differences on magnetic-storm class is analyzed. It is found that all particles with energies less than about 200 GeV enter a narrow belt along the equator and that higher-energy particles are primarily responsible for changes in the intensity differences. It is concluded that a strongly concentrated inhomogeneity during large storms can successively modulate the intensity in each direction.

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