Application of diffusion-convection model to diurnal anisotropy data

Details Application of diffusion-convection model to diurnal anisotropy data Application of diffusion-convection model to diurnal anisotropy data

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989em%26p...47...61m&link_type=abstract

Earth, Moon, and Planets (ISSN 0167-9295), vol. 47, Oct. 1989, p. 61-72.

Physics

7

Convection, Diffusion, Diurnal Variations, Particle Flux Density, Solar Activity, Solar Cosmic Rays, Anisotropy, Heliosphere, Interplanetary Magnetic Fields, Polarity, Transport Theory

Scientific paper

The diurnal anisotropy of cosmic-ray intensity observed over the period 1970-1977 has been analyzed using neutron-minotor data of the Athens and Deep River stations. The results indicate that the time of the maximum diurnal variation shows a remarkable systematic shift toward earlier hours than normally beginning in 1971. This phase shift continued until 1976, the solar activity minimum, except for a sudden shift to a later hour for one year, in 1974, the secondary maximum of solar activity. The behavior of the diurnal time of maximum has been shown to be consistent with the convective-diffusive mechanism which relates the solar diurnal anisotropy of cosmic-rays to the dynamics of the solar wind and of the interplanetary magnetic field.

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