Daily Variation of Cosmogenic Nuclide Be-7 Concentration in the Atmosphere and Solar Activities

Details Daily Variation of Cosmogenic Nuclide Be-7 Concentration in the Atmosphere and Solar Activities Daily Variation of Cosmogenic Nuclide Be-7 Concentration in the Atmosphere and Solar Activities

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.4221s&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

Concentrations of cosmogenic radioisotop e Be-7 in air were daily observed at Yamagata University during 2000 and 2002. From the power spectral analysis, the periodicity of the period of 26 days is shown for the daily Be-7 concentrations. The folding analysis shows that the phase delay of the Be-7 concentration was roughly 8 days to the sunspot number. These results indicate that the Be-7 concentrations in the air at ground level have 26-day periodicity as a component of time variations and it is caused by the solar modulation of galactic cosmic rays.

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