supergranulen.
/ˈsuːpəˌɡranjuːl/, /ˈsjuːpəˌɡranjuːl/, U.S. /ˈsupərˌɡrænjul/ Astronomy.
Each of the convective cells produced in the surface layer of the sun by supergranulation (supergranulation n. 2).
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supergranulation1962
supergranule1962
1962 Sky & Telescope Sept. 143 (caption) Note what Leighton calls supergranules, cells having bright parts toward the sun's center and dark edges toward the limb.
1976 D. F. Gray Observ. & Anal. Stellar Photospheres xviii. 442 The gas flow in a supergranule mimics that of the granule, but the size of the convective cell is about 20 times as large..and there is no brightness variation across a supergranule.
2002 J. B. Zirker Journey Center Sun vii. 125 Just below the photosphere, the horizontal flow in a supergranule is strong enough to displace the roots of a magnetic loop.
This entry has been updated (OED Third Edition, June 2012; most recently modified version published online March 2022).
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