Download or read book Comparisons of Power Spectrums of Artificial Time Series with Spectrum of a Plage Index written by Ralph Shapiro and published by . This book was released on 1966 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: A number of experiments are described whose purpose was to determine whether peaks in power spectrums of time series of solar indices reflect a tendency for equidistant separation in longitude of solar active regions or are produced by the analysis technique. From comparisons of power spectrums of artificial time series with the spectrum of a solar plage index it is clear that there is no appreciable tendency for equidistant spacing of active regions. (Author).