How does convection create the grain-like pattern called granulation on the Sun’s surface?

Granulation is a visible manifestation of convection occurring within the Sun’s outer layers. This process creates a grain-like pattern on the photosphere through the following mechanism:12

• Convective Transport: Great currents of hot plasma rise from the interior toward the surface, carrying thermal energy upward.32
• Granule Formation: These rising currents form individual convective cells, or granules, which typically measure between 1,000 and 1,500 kilometers in diameter.12
• Energy Radiation: Once the hot gas reaches the photosphere, it radiates its energy into space.1
• Cooling and Sinking: After radiating this energy, the gas cools, becomes denser, and sinks back into the solar interior.1

This cycle of rising hot gas and sinking cool gas creates a constantly changing, rice-grain-like pattern across the solar surface, with individual granules lasting for approximately 25 minutes before they fade or break apart.12