Emission line core in sunspots

  • #1

Main Question or Discussion Point

What makes the core of some chromospheric lines such as the transition at 8542 A of the infrared Ca II triplet appear in emission in the dark umbra of sunspots?
 

Answers and Replies

  • #2
115
40
The emission is from the chromosphere and can be seen in contrast against the strong absorption from the cooler photosphere of the spot.

A similar thing is now happening in Rho Cas where emission from a shell of material is showing in emission within some absorption lines as the stars photosphere cools.

Regards Andrew
 
  • #3
115
40
In addition there is enhanced chromospheric heating above the sunspots due to the concentration of magnetic flux enhancing the emission.
Regards Andrew
 

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