That part of the sun's surface under observation is known as the photosphere, that is, the part which radiates light.
It is from the photosphere, as has been said, that we have won most of our knowledge of the sun.
They seem to shrink away as a consequence of the photosphere closing in upon them.
The part of the Sun that we see is its luminous surface, or photosphere.
The systematic drift of the photosphere is strictly a drift in longitude; its direction is everywhere parallel to the equator.
Dark spots of a deep bluish black will often be seen on the photosphere of the sun.
Of the more special appearances which the photosphere presents, let us take first the faculæ.
The maze of her hair could hardly be told from the photosphere.
This is a layer of relatively cool gases lying immediately upon the photosphere.
Beneath the chromosphere is the layer of the sun from which emanates the light by which we see it, called the photosphere.
The lowest visible layer of a star, lying beneath the chromosphere and the corona. Stars are made entirely of gas and thus have no surface per se, but the gas beneath the photosphere is opaque, so the photosphere acts as their effective visible surface; it is also the boundary from which the Sun's diameter is measured. The Sun's photosphere is a very thin layer made up of numerous granules (transient convective cells) where hot gases rise and give off light and heat. The photosphere of the Sun has a temperature of around 6,000°K and is the region in which sunspot activity is located.