Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997astl...23..752a&link_type=abstract
Astronomy Letters, Volume 23, Issue 6, November 1997, pp.752-757; Pis'ma v Astronomicheskii Zhurnal, Vol. 23, p. 863
Astronomy and Astrophysics
Astronomy
3
Scientific paper
The fine structure of the granulation and its relationship to the mesogranular structure are studied by analyzing two-dimensional photometry of a unique high-quality stratospheric photograph of the solar photosphere. The following results have been obtained: (1) the derived asymmetric bimodal profile of the histogram of continuum intensity fluctuations of the granulation field is fitted by two different Gaussians, which describe the distribution of intensity fluctuations of intergranular lanes and granules with M_1(Delta I_) = _7% and M_2(Delta I+) = + 8%, sigma 1(Delta I_) = 5.5% and sigma 2(Delta I+) = 7.5%, S_1(Delta I_) = 54% and S_2(Delta I+) = 46%, respectively; (2) the main physical properties (temperature, velocity, size) of the granulation vary substantially along the photosphere; bright large granules with flows rising at higher velocity are predominantly concentrated inside the quasi-cells of mesogranules, while darker wide intergranular lanes with sinking flows are concentrated in intermesogranular lanes and occupy about 2/3 of their area; (3) the mesogranules are dominated by rising flows of hot matter, while the lanes between them are dominated by sinking flows of cool matter, suggesting a convective mechanism for their generation; (4) the quasi-periods obtained from the power spectrum confirm the presence of mesogranular quasi-cells with characteristic spatial scales of 2.5''_11''; (5) splitting in the upper layers of the solar convection zone, the mesogranular convective flows play a crucial role in producing granular convective overshoots with parameters that vary on mesoscales and in determining the variation of the physical fine-structure granulation properties along the photospheric surface.
Abdussamatov H. I.
Zlatopolo'Skii A. G.
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