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

  • S. I. Zharkov (a1), Elena Gavryuseva (a2) and Valentyna V. Zharkova (a3)

Abstract

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.

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References

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

  • S. I. Zharkov (a1), Elena Gavryuseva (a2) and Valentyna V. Zharkova (a3)

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