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Zonal structure and meridional drift of large-scale solar magnetic fields

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Abstract

Digitized synoptic charts of photospheric magnetic fields were analyzed for the past 4 incomplete solar activity cycles (1969–2000). The zonal structure and cyclic evolution of large-scale solar magnetic fields were investigated using the calculated values of the radial B r, |B r|, meridional B θ, |B θ|, and azimuthal B φ, |B φ| components of the solar magnetic field averaged over a Carrington rotation (CR). The time–latitude diagrams of all 6 parameters and their correlation analysis clearly reveal a zonal structure and two types of the meridional poleward drift of magnetic fields with the characteristic times of travel from the equator to the poles equal to ∼16–18 and ∼2–3 years. A conclusion is made that we observe two different processes of reorganization of magnetic fields in the Sun that are related to generation of magnetic fields and their subsequent redistribution in the process of emergence from the field generation region to the solar surface. Redistribution is supposed to be caused by some external forces (presumably, by sub-surface plasma flows in the convection zone).

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Authors and Affiliations

  1. IZMIRAN, 142190, Troitsk, Moscow Region, Moscow, Russia

    E.V. Ivanov & V.N. Obridko

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  1. E.V. Ivanov
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  2. V.N. Obridko
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Ivanov, E., Obridko, V. Zonal structure and meridional drift of large-scale solar magnetic fields. Sol Phys 206, 1–19 (2002). https://doi.org/10.1023/A:1014906831882

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