A unified theory of cosmic ray diurnal variations

Details A unified theory of cosmic ray diurnal variations A unified theory of cosmic ray diurnal variations

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..920b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 10, Sept. 1983, p. 920-923.

Physics

28

Anisotropy, Cosmic Rays, Diurnal Variations, Particle Theory, Solar Wind, Adiabatic Flow, Angular Distribution, Focusing, Harmonics, Heliosphere, Interplanetary Magnetic Fields, Magnetic Flux, Wave Scattering

Scientific paper

A theoretical explanation of the higher-order harmonics of the diurnal variation of the intensity of cosmic rays as measured on earth is presented, based on 1966-1975 Swarthmore neutron monitor (cutoff rigidity 2 GV). It is proposed that the second and third (12 and 8-hour) harmonics, like the first harmonic, can be attributed to the interaction of a spiral interplanetary magnetic field and the solar wind. Pitch-angle scattering (with lambda = about 0.5 AU and q = about 1.1 at 10-GV rigidity) and adiabatic focusing in a spatially varying mean field are shown to permit the calculation of 12 and 8-hour variations similar to those observed. Conversely, interplanetary scattering parameters can be inferred from ground-based diurnal-variation measurements.

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