Model of poleward magnetic field streams from sunspot butterflies

Zolotova Nadezda, ned@geo.phys.spbu.ru, St. Petersburg State University, Russian Fed
Ponyavin Dmitri, dponyavin@mail.ru, St. Petersburg State University

Abstract
The poleward magnetic field streams on time-latitude diagram of the photospheric magnetic field of the Sun during 1975-2011 (Kitt Peak NSO, SOLIS NSO, SOHO MDI data) are modeled. We performed simulations in terms of sunspot density distribution and bipole orientation according to Joy law and Hale cycle. The difference between distributions of leading and trailing activities of bipolar sunspots defines the so-called surplus. The meridional flow pattern is setting via inverse proportionality to the cycle shape. Finally, magnetic field streams and polar field reversals are a result of meridional drift of the surplus to the poles.