granule A convective cell, about 1,000 km in diameter, in the solar photosphere. Each granule lasts on average about five minutes and represents a temperature roughly 300° higher than the surrounding dark areas. At any one time, granules cover about one-third of the solar photosphere and are collectively referred to as granulation. Related category SOLAR TOPICS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) |