Solar granules are small, convective cells that form on the surface of the Sun, particularly in the photosphere, which is the visible layer of the Sun's atmosphere. Each granule typically measures about 1,000 kilometers (620 miles) across and is part of the dynamic process of convection that occurs in the Sun's outer layers. The formation of granules is driven by the rising and sinking of hot plasma.
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A solar granule is a photospheric convection cell, with relatively hot rising material in its interior and cooler descending material near its edges. The pattern formed by their bright interiors and darker edges is solar granulation. Their evolving horizontal outflows can sweep weak magnetic flux toward surrounding lanes.