Emission line core in sunspots

  • #1
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
209
80
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
209
80
In addition there is enhanced chromospheric heating above the sunspots due to the concentration of magnetic flux enhancing the emission.
Regards Andrew
 

Related Threads on Emission line core in sunspots

  • Last Post
Replies
5
Views
4K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
6
Views
4K
Replies
4
Views
2K
Replies
9
Views
4K
Replies
3
Views
1K
Replies
2
Views
3K
Replies
2
Views
1K
Replies
13
Views
2K
Replies
3
Views
5K
Top