Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-03-11
Astrophys.Space Sci. 258 (1998) 201-218
Astronomy and Astrophysics
Astrophysics
17 pages, LaTeX, 6 gif figure files attached, Workshop on Data Analysis Techniques, Brazil, November 1997
Scientific paper
10.1023/A:1001743509226
Wavelet analysis offers an alternative to Fourier based time-series analysis and is particularly useful when spectral features are time dependent. We analyze the solar neutrino capture rate of the radiochemical Homestake chlorine experiment with abbreviated Morlet wavelets, using Foster's (AJ, 111, 1709 (1996)) rescaled wavelet technique. We emphasize the complementarity of wavelet analysis to Fourier analysis. The Homestake data seem to contain a harmonic content with periodicities of 4.76 yr, 1.89 yr, 0.85 yr, and 0.51 yr. Wavelet analysis reveals that the 4.76 yr and 1.89 yr periods show an almost constant behavior over the 25 yr Homestake data record, while the 0.85 yr and 0.51 yr periods exhibit a transient phenomenon. The analysis does not show strong evidence for a period of the solar 11 yr cycle.
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