Granules on the photosphere of the Sun are caused by convection currents of plasma within the Sun's convective zone. The grainy appearance of the solar photosphere is produced by the tops of these convective cells and is called granulation. solar granulation NASA photo, modified 2004/02/07 by D. Windrim File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... solar granulation NASA photo, modified 2004/02/07 by D. Windrim File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... The photosphere of an astronomical object is the region at which the optical depth becomes one for a photon of wavelength equal to 5000 angstroms. ... The Sun is the star at the center of Earths solar system. ... Convection is the transfer of heat by the motion of or within a fluid. ... A Plasma lamp, illustrating some of the more complex phenomena of a plasma, including filamentation A solar coronal mass ejection blasts plasma throughout the solar system. ...
The rising part of the granules is located in the center where the plasma is hotter. The outer edge of the granules is darker due to the cooler descending plasma. In addition to the visible appearance, Doppler shift measurements of the light from individual granules provides evidence for the convective nature of the granules. The Doppler effect is the apparent change in frequency or wavelength of a wave that is perceived by an observer moving relative to the source of the waves. ...
Note: Each black or white bar on the graphic represents 1000 km. The typical granule lasts 20 minutes before dissipating. A kilometer (Commonwealth spelling: kilometre), symbol: km is a unit of length in the metric system equal to 1,000 metres (from the Greek words χίλια (khilia) = thousand and μÎÏ„Ïο (metro) = count/measure). ...
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