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On phase relation between toroidal and poloidal magnetic fields in the solar cycle 23

Published online by Cambridge University Press:  01 September 2007

S. I. Zharkov ,
Elena Gavryuseva  and
Valentyna V. Zharkova
S. I. Zharkov
Affiliation:
Department of Applied Mathematics, University of Sheffield, Sheffield, UK email: s.zharkov@sheffield.ac.uk
Elena Gavryuseva
Affiliation:
Arcetri Observatory/University of Florence, Florence, Italy, email: elena@arcetri.astro.it
Valentyna V. Zharkova
Affiliation:
Department of Computing and Mathematics, University of Bradford, Bradford, UK, email: v.v.zharkova@brad.ac.uk
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Abstract

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Phase relations is extracted at different latitudes between the weak background solar magnetic (poloidal) field and strong magnetic field associated with sunspots (toroidal field) by comparing low-resolution images from Wilcox Solar Observatory (WSO) and the high-resolution SOHO/MDI magnetograms. Sunspot areas and excess flux in all latitudinal zones (averaged with a sliding 1 year filter) reveal a strong positive correlation with the absolute and excess solar magnetic fields with a timelag of zero and ∼ 3 years. The residuals of a sunspot magnetic excess flux averaged by one year from those by 4 years are shown to have well defined periodic temporal and spatial structures. The periods of these structures are close to π/4 (π≈ 11 years). The structures have maxima at −40^ and +40^ and reveal spatial drifts with time either towards the equator or the poles depending on a latitude of sunspot occurences.

Keywords

Sun: activitySun: sunspotsSun: interiorSun: magnetic fieldmethods: data analysismethods: statistical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S247: Waves & Oscillations in the Solar Atmosphere: Heating and Magneto-Seismology , September 2007 , pp. 39 - 45
Copyright
Copyright © International Astronomical Union 2008

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