Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasj...50..125u&link_type=abstract
Publications of the Astronomical Society of Japan, v.50, p.125-139.
Astronomy and Astrophysics
Astronomy
13
Convection, Sun: Atmospheric Motion, Sun: Mesogranulation, Sun: Photosphere
Scientific paper
In this series we report on the results of our 3D velocity-field observation of the solar photosphere. The observation consisted of a 2D granulation imaging observation and a 1D slit spectroscopic observation. Both observations were performed simultaneously using the Domeless Solar Telescope of Hida Observatory, Kyoto University. In this paper we focus on the solar meso-sized velocity structure, i.e., mesogranulation. We investigated its spatial size, lifetime, velocity amplitude, and the relation between horizontal velocity and radial velocity. Our results are as follows: (1)The characteristic size of meso-granular cells is about 18''. (2)Especially at the region where the slit was placed, the patterns of the horizontal velocity divergence and of the radial velocity are closely related to each other, and their spatial sizes are also very consistent. (3)The peak of its lifetime distribution is located at 30--40 min, and (4)the relative frequency of mesogranular cells having a longer lifetime than 60 min is only 26%. (5)Solar mesogranulation is confirmed to be a convective phenomenon. An exceptional example of upward gas flow at the boundary of a strong mesogranulation cell was found. Discussions are also given concerning this abnormal phenomenon.
Kitai Reizaburo
Ueno Satoru
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