A possible mechanism for the origin of the tridiurnal variation in the cosmic radiation

Details A possible mechanism for the origin of the tridiurnal variation in the cosmic radiation A possible mechanism for the origin of the tridiurnal variation in the cosmic radiation

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243..322o&link_type=abstract

Astrophysical Journal, Part 1, vol. 243, Jan. 1, 1981, p. 322-328.

Astronomy and Astrophysics

Astrophysics

1

Astronomical Models, Cosmic Rays, Diurnal Variations, Interplanetary Space, Magnetic Rigidity, Anisotropy, Perturbation Theory, Pitch (Inclination), Radiation Detectors, Solar Wind

Scientific paper

A model is proposed for the origin of the tridiurnal variation observed by ground-based cosmic-ray detectors. This anisotropy is due to the first nonvanishing harmonic (beside the fundamental) in a sinusoidal expansion of the pitch-angle particle distribution in interplanetary space. The particle distribution is given by a perturbative expansion of the pitch-angle scattering equation for quasi-static conditions in the solar wind. Observational implications of the model, including the amplitude and phase of the tridiurnal variation and its rigidity dependence, are discussed.

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