Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...191..137s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 191, no. 1, Feb. 1988, p. 137-148.
Astronomy and Astrophysics
Astrophysics
35
Magnetic Field Configurations, Power Spectra, Solar Magnetic Field, Solar Rotation, Synoptic Measurement, Zonal Harmonics, Autocorrelation, Fourier Transformation, Resonant Frequencies, Signal To Noise Ratios, Time Series Analysis
Scientific paper
The properties of the global evolution of solar magnetic fields are investigated by carrying out a harmonic analysis of the zonal (m = 0) and the nonaxisymmetric (m not equal to 0) modes, using a 25-yr long (1959-1984) data set of synoptic magnetic field data. The zonal modes are shown to be governed by an extremely strict parity selection rule, the 22-yr resonance being the dominating feature for the odd modes while it is absent for the even modes. The even-parity modes exhibit instead a series of other resonant frequencies that increase with the spherical harmonic degree l, although with power amplitudes 5-10 smaller than the power of the odd-mode 22-yr peak. The nonaxisymmetric modes on the other hand show a number of well-defined resonant frequencies, which are independent of parity and of the values of l and m.
Guedel Manuel
Stenflo Jan Olof
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