Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21631701d&link_type=abstract
American Astronomical Society, AAS Meeting #216, #317.01; Bulletin of the American Astronomical Society, Vol. 41, p.898
Astronomy and Astrophysics
Astronomy
Scientific paper
Time series of synoptic maps from several observatories, along with data from an evolving surface-flux transport model, are analyzed in terms of their spherical harmonic decomposition. The characteristics of these spherical harmonic spectra, such as the relative amplitudes of various harmonic modes, at different phases of the solar cycle are shown. We illustrate how the rise and decline of the flux emergence rates, and the associated reversal of the polar dipole, throughout a sunspot cycle are reflected in the evolution of the various harmonic mode coefficients. We further discuss the interplay between the low-degree modes, in particular the dipole and quadrupole, and how such dynamics may trigger the reversal of the polar dipole during solar maximum.
Brun Allan Sacha
DeRosa Marc L.
Hoeksema Jon Todd
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