What is the lowest layer of the suns atmosphere called?

The lowest layer of the Sun's atmosphere is called the photosphere. It is the visible surface of the Sun from which light is emitted, and it has a temperature of about 5,500 degrees Celsius (9,932 degrees Fahrenheit). Above the photosphere lies the chromosphere and then the corona. The photosphere is also where sunspots appear as cooler, darker areas due to magnetic activity.