75:, but its origin is not precisely known. Although the presence of granules in the solar photosphere is a well-documented phenomenon, there is still much debate on the true nature or even the existence of higher-order granulation patterns. Some authors suggest the existence of three distinct scales of organization: granulation (with typical diameters of 150–2500 km), mesogranulation (5000–10000 km) and supergranulation (over 20000 km). Granules are typically considered as being signs of convective cells forming a hierarchic structure: supergranules would be thus fragmented in their uppermost layers into smaller mesogranules, which in turn would split into even smaller granules at their surface. The solar material would flow downward in dark "lanes" separating granules with the divisions between supergranules being the biggest concentrations of cold gas, analogous to rivers connecting smaller
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79:. It should however be stressed that this picture is highly speculative and might turn out to be false in the light of future discoveries. Recent studies show some evidence that mesogranulation was a ghost feature caused by averaging procedures.
63:). Later work (1960s) by Leighton, Noyes and Simon established a typical size of about 30000 km for supergranules with a lifetime of about 24 hours.
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a SOHO/MDI Dopplergram showing supergranular speed pattern
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Freedman, Roger A.; Kaufmann III, William J. (2008).
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177:"Living Reviews in Solar Physics"
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108:Hart, A. B. (1 February 1956).
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203:NASA: The Sun Does The Wave
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216:(cited on June 15, 2010).
208:Information at Nature.com
149:W. H. Freeman and Company
556:In mythology and culture
423:Supra-arcade downflows
127:10.1093/mnras/116.1.38
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477:Wolf number
450:Solar cycle
314:Photosphere
151:. pp.
89:Dopplergram
77:tributaries
57:photosphere
45:photosphere
33:observation
810:Categories
652:Solar time
573:In culture
530:Heliopause
482:Solar wind
413:Prominence
305:Atmosphere
290:Tachocline
95:References
821:Sun stubs
535:Bow shock
442:Variation
408:Nanoflare
735:Category
144:Universe
83:See also
61:granules
551:Eclipse
544:Related
365:Spicule
337:Sunspot
332:Faculae
327:Granule
251:The Sun
53:Doppler
380:Corona
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67:Origin
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492:Flare
360:Plage
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767:stub
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157:ISBN
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