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Analysis of synoptic data from the Vector Stokes Magnetograph (VSM) of theSynoptic Optical Long-term Investigations of the Sun (SOLIS) and the NASA/NSOSpectromagnetograph (SPM) at the NSO/Kitt Peak Vacuum Telescope facility showsthat the reversals of solar polar magnetic fields exhibit elements of astochastic process, which may include the development of specific patterns ofemerging magnetic flux, and the asymmetry in activity between northern andsouthern hemispheres. The presence of such irregularities makes the modelingand prediction of polar field reversals extremely hard if possible. In aclassical model of solar activity cycle, the unipolar magnetic regions (UMRs)of predominantly following polarity fields are transported polewards due tomeridional flows and diffusion. The UMRs gradually cancel out the polarmagnetic field of the previous cycle, and re-build the polar field of oppositepolarity setting the stage for the next cycle. We show, however, that thisdeterministic picture can be easily altered by the developing of a strongcenter of activity, or by the emergence of an extremely large active region, orby a "strategically placed" coronal hole. We demonstrate that the activityoccurring during the current cycle 24 may be the result of this randomness inthe evolution of the solar surface magnetic field.

The reversal of the Sun's magnetic field in cycle 24