Solar tri-diurnal variation of cosmic rays in a wide range of rigidity

Details Solar tri-diurnal variation of cosmic rays in a wide range of rigidity Solar tri-diurnal variation of cosmic rays in a wide range of rigidity

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....5..106m&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 5 p 106-109 (SEE N85-34991 23-93)

Mathematics

Anisotropy, Diurnal Variations, Energy Spectra, Solar Cosmic Rays, Diffusion, Mathematical Models, Muons, Neutron Counters, Neutron Irradiation, Neutrons

Scientific paper

Solar tri-diurnal variations of cosmic rays have been analyzed in a wide range of rigidity, using data from neutron monitors, and the surface and underground muon telescopes for the period 1978-1983. The rigidity spectrum of the anisotropy in space is assumed to be of power-exponential type as (P/gamma Po) to the gamma exp (gamma-P/Po). By means of the best-fit method between the observed and the expected variations, it is obtained that the spectrum has a peak at P (=gamma Po) approx = 90 GV, where gamma=approx 3.0 and Po approx. 30 GV. The phase in space of the tri-diurnal variation is also obtained as 7.0 hr (15 hr and 23 hr LT), which is quite different from that of approx. 1 hr. arising from the axisymmetric distribution of cosmic rays with respect to the IMF.

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