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Dipolar and Quadrupolar Magnetic Field Evolution over Solar Cycles 21, 22, and 23

Published online by Cambridge University Press:  12 August 2011

M. L. DeRosa ,
A. S. Brun  and
J. T. Hoeksema
M. L. DeRosa
Affiliation:
Lockheed Martin Solar and Astrophysics Laboratory, 3251 Hanover St. B/252, Palo Alto, CA 94304USA email: [email protected]
A. S. Brun
Affiliation:
Laboratoire AIM Paris-Saclay, CEA/Irfu Université Paris-Diderot CNRS/INSU, F-91191 Gif-sur-Yvette, France
J. T. Hoeksema
Affiliation:
Hansen Experimental Physics Laboratory, Stanford University, 466 Via Ortega, Stanford, CA 94305USA
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Abstract

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Time series of photospheric magnetic field maps from two observatories, along with data from an evolving surface-flux transport model, are decomposed into their constituent spherical harmonic modes. The evolution of these spherical harmonic spectra reflect the modulation of bipole emergence rates through the solar activity cycle, and the subsequent dispersal, shear, and advection of magnetic flux patterns across the solar photosphere. In this article, we discuss the evolution of the dipolar and quadrupolar modes throughout the past three solar cycles (Cycles 21–23), as well as their relation to the reversal of the polar dipole during each solar maximum, and by extension to aspects of the operation of the global solar dynamo.

Keywords

Sun: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S271: Astrophysical Dynamics: From Stars to Galaxies , June 2010 , pp. 94 - 101
Copyright
Copyright © International Astronomical Union 2011

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