Study of tri-diurnal variation of galactic cosmic radiation

Details Study of tri-diurnal variation of galactic cosmic radiation Study of tri-diurnal variation of galactic cosmic radiation

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....8610115a&link_type=abstract

Journal of Geophysical Research, vol. 86, Nov. 1, 1981, p. 10115-10121.

Physics

22

Cosmic Rays, Diurnal Variations, Galactic Radiation, Anisotropic Media, Data Processing, Interplanetary Medium, Mesons, Neutrons, Radiation Measuring Instruments, Signal To Noise Ratios, Solar Wind Velocity

Scientific paper

Using the experimental data of the high-counting-rate neutron and meson monitors, the solar tri-diurnal anisotropy of galactic cosmic radiation is investigated for the period 1962-1979. The enhancement of the average tri-diurnal amplitude observed by all the detectors during 1973-1975 gives sufficient signal to noise ratio to obtain its variational characteristics. The observations are found to be consistent with an interplanetary anisotropy with a power law rigidity spectrum exponent of approximately one. The tri-diurnal amplitude is found to vary as the cube of the cosine of lambda, lambda being the effective asymptotic latitude of the detector.

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