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We consider the physical origin of the hemispheric pattern of filamentchirality on the Sun. Our 3D simulations of the coronal field evolution over aperiod of 6 months, based on photospheric magnetic measurements, werepreviously shown to be highly successful at reproducing observed filamentchiralities. In this paper we identify and describe the physical mechanismsresponsible for this success. The key mechanisms are found to be (1)differential rotation of north-south polarity inversion lines, (2) the shape ofbipolar 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 astatistical sense. Exceptions arise naturally for filaments in certainlocations relative to bipolar active regions, or from interactions between anumber of active regions.

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