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Advances in AstronomyVolume 2012 2012, Article ID 691408, 11 pages

Research Article

Instituto de Geofísica, Universidad Nacional Autónoma de México, C.U., 04510 Coyoacán, DF, Mexico

International Academy for Appraisal and Consulting MAOK, Moscow, Russia

IZMIRAN, Academy of Sciences of Russia, Troitsk, Moscow 142092, Russia

Received 6 September 2012; Accepted 27 October 2012

Academic Editor: Karel Kudela

Copyright © 2012 Jorge Pérez-Peraza et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Cosmogenic isotopes have frequently been employed as proxies of ancient cosmic ray fluxes. On the basis of periodicities of the

Be time series using data from both the South and North Poles and the

C time series with data from Intercal-98, we offer evidence of the existence of cosmic ray fluctuations with a periodicity of around 30 years. Results were obtained by using the wavelet transformation spectral technique, signal reconstruction by autoregressive spectral analysis ARMA, and the Lomb-Scargle periodogram method. This 30-year periodicity seems to be significant in nature because several solar and climatic indexes exhibit the same modulation, which may indicate that the 30-year frequency of cosmic rays is probably a modulator agent for terrestrial phenomena, reflecting the control source, namely, solar activity.

Autor: Jorge Pérez-Peraza, Víctor Velasco, Igor Ya. Libin, and K. F. Yudakhin



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