When you look at the sun through a filtered telescope, you notice a blotchy appearance. the part of the sun that you are observing is the this appearance is called

The part of the Sun that you are observing when you see a blotchy appearance is the surface of the sun. This appearance is called granulation which is caused by the convection of the hot material inside the sun which go up and down the surface of the sun. Because of its sandy texture it is sometimes called lemon peel or rice grain.