supergranulation cell

noun Astronomy.
one of a number of large convection cells in the photosphere and chromosphere of the sun, each having a diameter of 10,000–20,000 miles (16,000–32,000 km) and lasting longer than a day.
Also called supergranulation.

1970–75; super- + granulation Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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