Families of fragmenting granules and their relation to meso- and supergranular flow fields

Details Families of fragmenting granules and their relation to meso- and supergranular flow fields Families of fragmenting granules and their relation to meso- and supergranular flow fields

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...409..299r&link_type=abstract

Astronomy and Astrophysics, v.409, p.299-308 (2003)

Astronomy and Astrophysics

Astrophysics

26

Sun: Photosphere, Sun: Granulation

Scientific paper

3D analysis (x,y,t) of the granular intensity field (11-hour time sequence from the Swedish Vacuum Solar Telescope on La Palma, Canary Islands), demonstrates that a significant fraction of the granules in the photosphere are organized in the form of ``Trees of Fragmenting Granules" (TFGs). A TFG consists of a family of repeatedly splitting granules, originating from a single granule at its beginning. A striking result is that TFGs can live much longer (up to 8 h) than individual granules (10 min). We find that 62% of the area covered by granules belongs to TFGs of a lifetime >1.5 h. When averaged in time, such long-lived TFGs correspond to coherent diverging flows which may be identified as mesogranules. We also find a correlation between the network and the spatial distribution of TFGs.

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