Observations

Figure 1. Close-up of the solar surface, 2002-07-24, showing faculae on the near edge of many of the granules.

 

• width: ~1 Mm
• duration: ~20 minutes
• dynamics: Bénard cells (updraft in center, downdraft around outside)
• speed up: ~2 km/s (supersonic)
• speed down: ~7 km/s (hypersonic)