Hydrodynamic Instabilities and Photospheric Structures

Details Hydrodynamic Instabilities and Photospheric Structures Hydrodynamic Instabilities and Photospheric Structures

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000arep...44...56g&link_type=abstract

Astronomy Reports, Volume 44, Issue 1, January 2000, pp.56-63

Astronomy and Astrophysics

Astronomy

2

Scientific paper

The possible role of convective-flow instabilities in the formation of certain structures observed in the solar photospheric and subphotospheric layers is discussed. High-resolution video records suggest that the granulation field is structurally and dynamically ordered in accordance with the mesogranulation pattern. Thus, it strikingly resembles the so-called spoke patterns of convection observed experimentally. These patterns could be produced by some instability of the mesogranular flow. Mesogranules seem to be the main structural features of the velocity field, whereas granules behave as relatively passive elements—blobs of overheated material carried by the mesogranular flow. One possible mechanism for their origin is the development of a three-dimensional analogue of the one-blob or the two-blob instability known from studies of convection. In particular, if this interpretation is adopted, the phenomenon of exploding granules can be accounted for in a natural way.

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