Power Spectrum Analysis In Search For Periodicities In Solar Irradiance Time Series Data From Erbs

Abstract

In the present paper we have analyzed the solar irradiance data from the Earth Radiation Budget Satellite (ERBS) during the time period from October 15, 1984 to October 15, 2003 to detect the corresponding periods, if any with relevant scores (confidence). Power spectrum of the denoised signal has been obtained using FFT in order to search for its periodicities. Present calculation reveals strong periods around 9.08-9.35, 13.53-14.03, 27.50-28.17, 30.26, 35.99-36.37, 51.14-51.52, 68.27-68.60, 101.15, 124.85, 150.63-153.98, 659.90, 729.37, 1259.82, 3464.50 and 4619.33 days. We also got some weak periods around 46.19, 72.55, 82.49, 137.21-139.98, 395.94, 407.59 and 1979.71 days.

Keywords

• FFT
• Power Spectrum
• periodicities
• scores