Periodicity of about 13 days in the cosmic-ray intensity in the solar cycles no. 18, 19 and 20

Details Periodicity of about 13 days in the cosmic-ray intensity in the solar cycles no. 18, 19 and 20 Periodicity of about 13 days in the cosmic-ray intensity in the solar cycles no. 18, 19 and 20

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982rbrfi..12.....f&link_type=abstract

Revista Brasileira de Fisica, Vol. 12, No. 4, p 599 - 610

Computer Science

Cosmic Ray Showers, Particle Flux Density, Solar Cosmic Rays, Solar Cycles, Amplitude Distribution Analysis, Interplanetary Magnetic Fields, Ionization Chambers, Periodic Variations, Signal To Noise Ratios, Solar Activity Effects, Sunspots, Twenty-Seven Day Variation

Scientific paper

The quasi-periodical variations of the cosmic-ray intensity, with a period of about 13 days, have been studied in the data recorded through shielded ionization chambers at Huancayo and at Cheltenham-Fredericksburg during the solar cycles no. 18, 19 and 20 (1944-1974). The temporal variation of the annual average amplitudes of the oscillation of about 13 days for both stations is compared with the behavior of the Wolf number R of sunspot. For the cycles no. 18 and 19, these amplitudes present, like of 27-day oscillation, two maxima, while for the cycle no. 20 there is only one clear maximum. In this work is also presented the negative correlation between the annual mean cosmic-ray intensity and the amplitude of the 13-day oscillation.

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