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The apparent,visable surface of the sun. The photosphere is a gaseous atmospheric layer a few hundred miles deep with a diameter of 864,000 mi.(1,391,600km; usually considered the diameter of the sun)and an average temperature of approximately 5800k(10,500f).Radiation emmited from the photosphere accounts for most of the solar energy flux at the earth. Convective cells give the photsphere a granular appearence with bright cells (hot rising gas)sorround by dark intergranular lanes(cool descending gas). A typical granualeis approximatly 600mi.(1000 km)in diameter. Measurements of horizontal velocity reveal a larger convective pattern,the supergranulation; the horizontal motion of individual granules reveals intemediate scale convective flows.:)
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