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Título del libro: Proceedings Of The 33rd International Cosmic Rays Conference, Icrc 2013
Título del capítulo: Wavelet and fractal frequency analysis of the Mexico City neutron monitor signal

Autores UNAM:
BERNARDO VARGAS CARDENAS; JOSE FRANCISCO VALDES GALICIA; LIZBETH PEÑALOZA VELASCO; JOSE GERARDO LOPEZ BONIFACIO; ALEJANDRO HURTADO PIZANO; OCTAVIO FELIX MUSALEM CLEMENTE;
Autores externos:

Idioma:
Inglés
Año de publicación:
2013
Palabras clave:

Cosmology; Discrete Fourier transforms; Fourier analysis; Fractals; Neutron detectors; Neutrons; Time series analysis; Wavelet analysis; Wavelet transforms; Confidence levels; Cosmic ray intensity; Fractal analysis; Frequency Analysis; Neutron monitors; Power density functions; Relative contribution; Time evolutions; Cosmic rays


Resumen:

We studied cosmic ray intensity variations in the whole database of the Mexico City neutron monitor station from 1990 to 2013 using wavelet transforms to determine the power density function and its time evolution, with which we have identified the mid- and long-term variations present in the registers. We give the corresponding confidence levels for the periodicities found and their relative contribution to the total power of such variations. We also performed a fractal analysis of the time series to identify its intrinsic variations and long-term persistency. Consistent results were found with both kinds of analysis. As a reference, we compare these results with those of classical Fourier analysis based on the discrete Fourier transform. © 2013 Sociedade Brasileira de Fisica. All Rights Reserved.


Entidades citadas de la UNAM: