Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..552k&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Astronomy and Astrophysics
Astronomy
3
Scientific paper
The temporal evolution of the solar magnetic field during solar cycles 20 21 and 22 has been investigated by means of spherical harmonic decomposition and subsequent time series analysis. A 33 yr and a 25 yr time series of daily magnetic maps of the solar photosphere recorded at the Mount Wilson and NSO/Kitt Peak observatories respectively were used to calculate the spherical coefficients of the radial magnetic field. Fourier and wavelet analysis were then applied to deduce the temporal variations. Besides the obvious ~22 yr magnetic cycle shorter-lived fluctuations have been detected. However a resonant modal structure of the solar magnetic field (apart from the 22 yr cycle) has not been found which is in contrast to earlier studies. We will present our results for axisymmetric and non-axisymmetric modes and compare them with recent studies of large scale magnetic structures on cool stars.
Knaack R.
Stenflo Jan Olof
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