Physics – Optics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978s%26w....17..207m&link_type=abstract
Sterne und Weltraum, vol. 17, June 1978, p. 207-209. In German.
Physics
Optics
1
Solar Granulation, Solar Physics, Stellar Structure, Astronomical Photography, Atmospheric Optics, Convection Currents, Fraunhofer Lines, Photosphere, Solar Interior, Solar Spectra, Solar Temperature, Turbulence Effects
Scientific paper
Initial problems concerning the study of solar granulation are related to phenomena produced in photographs of granulation by the disturbed optical characteristics of the terrestrial atmosphere (seeing). The interest in granulation investigations increased significantly in the 1950's in connection with developments in theoretical astrophysics. Unsoeld (1930) had shown that the convection in the interior of the sun plays a decisive part at the temperatures at which hydrogen is ionized, corresponding to areas just below the solar 'surface'. He pointed out the relation between granulation and convection. At about 1950, the theory of turbulent processes had reached a level at which questions were asked concerning the size distribution and the temperature differences found in granulation. Ground-based and balloon-based observations introduced at this time the era of modern granulation observations. Attention is given to the granulation phenomenon, the physical processes involved, and the possibilities to obtain information regarding the characteristic parameters of the convection zone on the basis of granulation studies.
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