What is the name of the middle layer of the sun's atmosphere?

The middle layer of the sun's atmosphere is called the chromosphere. This layer lies above the photosphere, which is the visible surface of the sun, and below the corona, which is the outermost layer. The chromosphere is characterized by its reddish color and is visible during solar eclipses as a thin ring or band. In the chromosphere, temperatures increase from around 4,500 Kelvin to 20,000 Kelvin, and it is where various solar phenomena such as spicules and solar flares occur. This layer plays a crucial role in solar activity and is important for understanding the sun's magnetic field and how it affects space weather. The other terms refer to different parts or concepts related to the sun or outer space but do not refer to the middle layer of the sun's atmosphere specifically.