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- W3098600591 endingPage "110" @default.
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- W3098600591 abstract "Using Fourier and wavelet analysis, we critically re-assess the significance of our detection of periodic pulsations in coronal loops. We show that the proper identification of the frequency dependence and statistical properties of the different components of the power spectra provides a strong argument against the common practice of data detrending, which tends to produce spurious detections around the cut-off frequency of the filter. In addition, the white and red noise models built into the widely used wavelet code of Torrence & Compo cannot, in most cases, adequately represent the power spectra of coronal time series, thus also possibly causing false positives. Both effects suggest that several reports of periodic phenomena should be re-examined. The Torrence & Compo code nonetheless effectively computes rigorous confidence levels if provided with pertinent models of mean power spectra, and we describe the appropriate manner in which to call its core routines. We recall the meaning of the default confidence levels output from the code, and we propose new Monte-Carlo-derived levels that take into account the total number of degrees of freedom in the wavelet spectra. These improvements allow us to confirm that the power peaks that we detected have a very low probability of being caused by noise." @default.
- W3098600591 created "2020-11-23" @default.
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- W3098600591 date "2016-07-07" @default.
- W3098600591 modified "2023-10-18" @default.
- W3098600591 title "ON THE FOURIER AND WAVELET ANALYSIS OF CORONAL TIME SERIES" @default.
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- W3098600591 doi "https://doi.org/10.3847/0004-637x/825/2/110" @default.
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