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 a few thousand 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,
with a dip down to 3800 K between.
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/image-article/layers-of-sun/
Referenced by pages:
chromospheric activity index
corona
Coronal Solar Magnetism Observatory (COSMO)
Mauna Loa Solar Observatory (MLSO)
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