Multitaper spectral analysis of cosmic rays São Martinho da Serra's muon telescope and Newark's neutron monitor data

Abstract

ABSTRACT. In this work we present an analysis on the correction efficiency of atmospheric effects on cosmic ray São Martinho da Serra's muon telescope and Newark's neutron monitor data. We use a Multitaper spectral analysis of cosmic rays time series to show the main periodicities present in the corrected and uncorrected data for the atmospheric effects. This kind of correction is very important when intends to study cosmic rays variations of extra-terrestrial origin.Keywords: multitaper spectral analysis, cosmic rays, atmospheric effects, pressure and temperature correction. RESUMO. Neste trabalho apresentamos a eficiência da correção dos efeitos atmosféricos nos dados de raios cósmicos do telescópio de muons de São Martinho daSerra e do monitor de nêutrons de Newark. Utilizamos a análise espectral Multitaper das séries temporais dos raios cósmicos, para mostrar as principais periodicidades presentes nos dados corrigidos e não corrigidos dos efeitos atmosféricos. Este tipo de correçãoé de extrema importância quando se pretende estudar as variações de raios cósmicos de origem extraterrestre.Palavras-chave: análise espectral multitaper, raios cósmicos, efeitos atmosféricos, correção da pressão e temperatura.

Study of the Effects of Atmospheric Pressure in the Time Series of Muon Detector Using the Method of Spectral Analysis

“…Its flow incident on the Earth's atmosphere is basically modulated by three processes: 1) Variations of the solar wind within the heliosphere (with time scale 10 to 1,000 years); 2) Variations of the Earth's magnetic field (100 -10,000 years); 3) Variations of the interstellar flow outside the heliosphere (>106 years) [12]. Variations with short periods of time and with a terrestrial origin are called seasonal and diurnal variations, caused by differences in the Earth's atmospheric structure between the winter and summer seasons, and between the day and night [13]- [15]. Other variation of the cosmic radiation, with a climatic origin, but with glacial periods, is due to orbital parameters.…”