Why Does the Core of Certain Chromospheric Lines Appear in Emission in Sunspots?

  • Context: Graduate 
  • Thread starter Thread starter spossatamente
  • Start date Start date
  • Tags Tags
    Core Emission Line
Click For Summary
SUMMARY

The core of certain chromospheric lines, specifically the transition at 8542 Å of the infrared Ca II triplet, appears in emission within the dark umbra of sunspots due to enhanced chromospheric heating. This phenomenon occurs as a result of concentrated magnetic flux, which increases emission levels in contrast to the cooler photospheric absorption. A similar emission behavior is observed in the star Rho Cas, where a shell of material exhibits emission within some absorption lines as its photosphere cools.

PREREQUISITES
  • Understanding of chromospheric lines and their significance in solar physics
  • Familiarity with the infrared Ca II triplet and its spectral characteristics
  • Knowledge of magnetic flux concentration and its effects on solar emissions
  • Basic concepts of stellar atmospheres and temperature gradients
NEXT STEPS
  • Research the mechanisms of chromospheric heating in sunspots
  • Study the spectral analysis of the Ca II triplet and its implications
  • Explore the magnetic field dynamics in solar phenomena
  • Investigate the emission characteristics of Rho Cas and similar stars
USEFUL FOR

Astronomers, astrophysicists, and solar physicists interested in solar emissions, sunspot dynamics, and stellar atmospheric studies.

spossatamente
Messages
15
Reaction score
0
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?
 
Astronomy news on Phys.org
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
 
In addition there is enhanced chromospheric heating above the sunspots due to the concentration of magnetic flux enhancing the emission.
Regards Andrew
 

Similar threads

Undergrad Solar chromosphere: inter-conversion of Ca I, Ca II, role of photons
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Formation of emission lines and other topics
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Assumptions for blackbody spectra vs. emission spectra vs. absorption spectra
  • · Replies 8 ·
Replies
8
Views
5K
Undergrad Understanding Gunn-Peterson through the Reionization epoch
  • · Replies 11 ·
Replies
11
Views
5K
Undergrad Observing Emission Spectra from Computer Screens
  • · Replies 2 ·
Replies
2
Views
2K
Stargazing Level of details in prime focus vs eyepiece images
  • · Replies 226 ·
8
Replies
226
Views
17K
Graduate Unidentified emission line in Galaxy Clusters
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Cause of spontaneous emission?
  • · Replies 15 ·
Replies
15
Views
4K
Undergrad Only certain emission lines show up in absorption spectrum
  • · Replies 4 ·
Replies
4
Views
3K
Graduate On the Origin of Solar and Stellar Magnetic Fields
  • · Replies 7 ·
Replies
7
Views
5K