Supergranulation is a particular pattern of convection cells on the Sun`s surface called supergranules. It was discovered in the 1950s by A.B.Hart using Doppler velocity measurements showing horizontal flows on the photosphere (flow speed about 300 to 500 m/s, a tenth of that in the smaller granules). Later work (1960s) by Leighton, Noyes and Sim....
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http://en.wikipedia.org/wiki/Supergranulation
(from the article `Sun`) [2 related articles]
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http://www.britannica.com/eb/a-z/s/187
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