Solar Physics

, Volume 254, Issue 1, pp 77–88 | Cite as

Modelling the Global Solar Corona: III. Origin of the Hemispheric Pattern of Filaments

Article

Abstract

We consider the physical origin of the hemispheric pattern of filament chirality on the Sun. Our 3D simulations of the coronal field evolution over a period of six months, based on photospheric magnetic measurements, were previously shown to be highly successful at reproducing observed filament chiralities. In this paper we identify and describe the physical mechanisms responsible for this success. The key mechanisms are found to be (1) differential rotation of north – south polarity inversion lines, (2) the shape of bipolar active regions, and (3) evolution of skew over a period of many days. As on the real Sun, the hemispheric pattern in our simulations holds in a statistical sense. Exceptions arise naturally for filaments in certain locations relative to bipolar active regions or from interactions among a number of active regions.

Keywords

Magnetic fields: Corona Prominences: Magnetic field Helicity: Magnetic 

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Harvard-Smithsonian Center for AstrophysicsCambridgeUSA
  2. 2.School of Mathematics and StatisticsUniversity of St AndrewsFifeScotland

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