Diurnal variation of cosmic ray intensity. I - Two approaches to the study

Details Diurnal variation of cosmic ray intensity. I - Two approaches to the study Diurnal variation of cosmic ray intensity. I - Two approaches to the study

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.5139s&link_type=abstract

Journal of Geophysical Research, vol. 83, Nov. 1, 1978, p. 5139-5150. NATO-supported research.

Physics

10

Cosmic Rays, Diurnal Variations, Particle Flux Density, Anisotropy, Data Reduction, Diffusion Coefficient, Fourier Series, Interplanetary Magnetic Fields, Magnetic Effects, Power Spectra, Solar Wind Velocity

Scientific paper

Both the traditional Fourier series method and the more recently introduced power spectral method were used to investigate the daily variation of cosmic ray intensity for the period of mid-December 1965 to April 1966, and problems relating to the analyses of both data sets on a day-to-day basis and on a statistical basis are discussed. Capabilities and limitations of the two approaches are described. General agreement is found between the observed diurnal variation over each period considered and that predicted theoretically from parameters but, since the ratio of the perpendicular diffusion coefficient to the parallel diffusion coefficient is small, the diurnal variation amplitude is more sensitive to the interplanetary field direction and the solar wind velocity. Interplanetary magnetic field data from Pioneer 6 were available for the investigated period.

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