the surface of such a figure a spherical surface. Cameron), American Institute of Physics, New York, pp. a solid geometric figure generated by the revolution of a semicircle about its diameter a round body whose surface is at all points equidistant from the center. The visible photosphere, or sphere of light, is the level of the solar atmosphere from which we get our light and heat, and it is the part that we can see with our eyes. (1984) A golden age for solar physics, in Astrophysics Today, (ed. Lang, in Encyclopedia of Geology, 2005 The Outer Solar Atmosphere.
(1976) Structure of the solar chromosphere, Ap. (1980) Numerical simulations of the solar granulation, IAU Coll., 51, 17. (1985) Solar-stellar outer atmospheres and energetic particles and galactic cosmic rays, Ap. (1987) Mesure du diamètre du Soleil à l'astrolabe solaire, C. (1993) Imagerie Doppler d'une étoile T Tauri. The photosphere is not like the surface of a planet even if you could tolerate the heat, you couldn't stand on it. It is what we see as the visible surface of the Sun. (Address delivered at the semi-centennial of the National Academy of Sciences, at Washington, DC May 1913.) The boundary between the Sun's interior and the solar atmosphere is called the photosphere. (1986) Effects of solar electromagnetic radiation on the terrestrial environment, in Physics of the Sun. (1967) Solar oblateness and general relativity. (1976) Convective velocities derived from granules contrast profiles in Fe I. (1900) Preliminary statement of the results of the Smithsonian Observatory Eclipse expedition, Astrophys. The visible surface of the Sun is the outer limit of the photosphere, where the.Ībbot, C. Abbot (1900)postulated that it was gaseous, and now it is recognized as a plasma. Light emitted from deeper, denser layers.
Until the beginning of the 20th century, the Sun's surface was assumed to be a hot liquid. Description: The photosphere (light sphere) is the layer of a star from which the light that we observe emerges. The outer limit of the solar photosphere is taken to be the boundary of the visible solar disk as seen in white light. The photosphere of the Sun is the best studied, but with increased development of powerful techniques (interferometry, Doppler imaging), the photospheres of certain other particular stars are becoming known: for instance, spots have been detected on young stars such as T Tauri (Joncour, 1992). The effective temperatures of stellar photospheres range between about 50 000 K for massive young supergiants to below 2000 K for cool dwarf stars. The photosphere is the layer of a stellar atmosphere that emits the continuous radiation carrying most of the star's luminous energy ( Plate 1).
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