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The observed long- and short-term phase relation between the toroidal and poloidal magnetic fields in cycle 23

Zharkov, S; Gavryuseva, E; Zharkova, V; (2008) The observed long- and short-term phase relation between the toroidal and poloidal magnetic fields in cycle 23. In: SOLAR PHYSICS. (pp. 339 - 358). SPRINGER

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Abstract

The observed phase relations between the weak background solar magnetic (poloidal) field and strong magnetic field associated with sunspots (toroidal field) measured at different latitudes are presented. For measurements of the solar magnetic field (SMF) the low-resolution images obtained from Wilcox Solar Observatory are used and the sunspot magnetic field was taken from the Solar Feature Catalogues utilizing the SOHO/MDI full-disk magnetograms. The quasi-3D latitudinal distributions of sunspot areas and magnetic fields obtained for 30 latitudinal bands (15 in the northern hemisphere and 15 in the southern hemisphere) within fixed longitudinal strips are correlated with those of the background SMF. The sunspot areas in all latitudinal zones (averaged with a sliding one-year filter) reveal a strong positive correlation with the absolute SMF in the same zone appearing first with a zero time lag and repeating with a two- to three-year lag through the whole period of observations. The residuals of the sunspot areas averaged over one year and those over four years are also shown to have a well defined periodic structure visible in every two-to-three years close to one-quarter cycle with the maxima occurring at -40 degrees and +40 degrees and drifts during this period either toward the equator or the poles depending on the latitude of sunspot occurrence. This phase relation between poloidal and toroidal field throughout the whole cycle is discussed in association with both the symmetric and asymmetric components of the background SMF and relevant predictions by the solar dynamo models.

Type:Proceedings paper
Title:The observed long- and short-term phase relation between the toroidal and poloidal magnetic fields in cycle 23
Event:3rd Solar Image Processing Workshop
Location:Trinity Coll, Dublin, ISRAEL
Dates:2006-09
DOI:10.1007/s11207-007-9109-0
Additional information:Invalid ISBN ta analysis read from Web of Science.
Keywords:Solar cycle, observations, Sunspots, magnetic fields, statistics, SOLAR DYNAMO, DIFFERENTIAL ROTATION, SUN, TACHOCLINE, CATALOG, TILT
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Space and Climate Physics

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