Physics
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ang....38...61d&link_type=abstract
Annales de Geophysique, vol. 38, Jan.-Mar. 1982, p. 61-73.
Physics
Fast Fourier Transformations, Geomagnetism, Line Spectra, Periodic Variations, Spectrum Analysis, Annual Variations, Diurnal Variations, Geomagnetic Micropulsations, Power Spectra, Solar Radiation, Solar Rotation, Time Series Analysis
Scientific paper
A classical Fourier spectral analysis is presented to study the periodic variations in the hourly, daily and annual means of the D, Z and H components of the geomagnetic field at a single station (Dourbes, Belgium). The Fast Fourier Transform technique is used to systematically identify all significant lines between 1 day and 70 years. The spectra display marked peaks at periods of one day, 17 days, six months, one year and 11 years; several harmonics of the fundamental variations are also detected. The 27-day band actually consists of a grouping of narrow lines; a possible amplitude modulation model of the mean solar rotation period is suggested. Minor peaks are observed near 32, 38, 54 and 80 days, 1.19 years and 1.4 years. Finally the spectrum is dominated by a strong line with a period of the order of 65 years. Earlier conclusions on the mechanisms of these variations are reconsidered.
de Meyer F.
de Vuyst A.
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