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We investigated the role of photospheric plasma motions in the formation andevolution of polar magnetic patches using time-sequence observations with highspatial resolution. The observations were obtained with the spectropolarimeteron board the Hinode satellite. From the statistical analysis using 75 magneticpatches, we found that they are surrounded by strong converging,supergranulation associated flows during their apparent life time and that theconverging flow around the patch boundary is better observed in the Dopplervelocity profile in the deeper photosphere. Based on our analysis we suggestthat the like-polarity magnetic fragments in the polar region are advected andclustered by photospheric converging flows thereby resulting in the formationof polar magnetic patches. Our observations show that, in addition to directcancellation magnetic patches decay by fragmentation followed by unipolardisappearance or unipolar disappearance without fragmentation. It is possiblethat the magnetic patches of existing polarity fragment or diffuse away intosmaller elements and eventually cancel out with opposite polarity fragmentsthat reach the polar region around solar cycle maximum. This could be one ofthe possible mechanisms by which the existing polarity decay during thereversal of the polar magnetic field.

Photospheric Flow Field Related to the Evolution of the Sun's Polar Magnetic Patches Observed by Hinode SOT