chromosphere
(middle layer of the Sun's atmosphere)
The chromosphere is the layer of the Sun's atmosphere outside
the photosphere and inside the solar transition region.
It is about 2000 kilometers deep and its density is
a hundred millionth that of the Earth's atmosphere.
The inner boundary is 6000 K and the outer boundary is 35000 K.
The chromosphere is visible during a solar eclipse.
The term plage is used for certain kinds of bright
regions of the chromosphere. They occur near sunspots.
(Sun,stars,stellar atmosphere)
Further reading:
https://en.wikipedia.org/wiki/Chromosphere
https://en.wikipedia.org/wiki/Plage_(astronomy)
https://solarscience.msfc.nasa.gov/feature2.shtml
https://astronomy.swin.edu.au/cosmos/C/Chromosphere
https://www.nasa.gov/mission_pages/iris/multimedia/layerzoo.html
Referenced by pages:
chromospheric activity index
corona
Coronal Solar Magnetism Observatory (COSMO)
High Altitude Observatory (HAO)
Moreton wave
OSO 8
photosphere
plasma wave
spicule
standard model of a flare
stellar atmosphere
Sun
Sun surface features
transition region
Wilson-Bappu effect
Index