![]() ![]() (1988) Astrophysics of the Sun, Cambridge University Press, New York, 433 pp. Cameron), American Institute of Physics, New York, pp. (1984) A golden age for solar physics, in Astrophysics Today, (ed. (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. noun photosphere f-t-sfir 1 : a sphere of light or radiance 2 : the luminous surface layer of the sun or a star photospheric f-t-sfir-ik -sfer- adjective Example Sentences Recent Examples on the Web Despite their great temperatures, dwarf stars can and do harbor water molecules in their own atmospheres their photospheres. (1987) Mesure du diamètre du Soleil à l'astrolabe solaire, C. (1993) Imagerie Doppler d'une étoile T Tauri. (Address delivered at the semi-centennial of the National Academy of Sciences, at Washington, DC May 1913.) (1986) Effects of solar electromagnetic radiation on the terrestrial environment, in Physics of the Sun. From this thin layer - which is only about 300 km deep - most of the. ![]() (1967) Solar oblateness and general relativity. The photosphere is the visible surface of the Sun. member of the science definition team for Solar Orbiter (2003). (1976) Convective velocities derived from granules contrast profiles in Fe I. the stability of magnetic structures anchored in the photosphere such as coronal loops. (1900) Preliminary statement of the results of the Smithsonian Observatory Eclipse expedition, Astrophys. Photosphere, visible surface of the Sun, from which is emitted most of the Sun’s light that reaches Earth directly. 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. Until the beginning of the 20th century, the Sun's surface was assumed to be a hot liquid. 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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