Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-12-13
Astronomy and Astrophysics
Astrophysics
19 pages, 11 figures (pre-print format). Accepted for publication in ApJ
Scientific paper
10.1086/528680
Two of the most attractive spectral windows for spectropolarimetric investigations of the physical properties of the plasma structures in the solar chromosphere and corona are the ones provided by the spectral lines of the He I 10830 A and 5876 A (or D3) multiplets, whose polarization signals are sensitive to the Hanle and Zeeman effects. However, in order to be able to carry out reliable diagnostics, it is crucial to have a good physical understanding of the sensitivity of the observed spectral line radiation to the various competing driving mechanisms. Here we report a series of off-the-limb non-LTE calculations of the He I D3 and 10830 A emission profiles, focusing our investigation on their sensitivity to the EUV coronal irradiation and the model atmosphere used in the calculations. We show in particular that the intensity ratio of the blue to the red components in the emission profiles of the He I 10830 A multiplet turns out to be a good candidate as a diagnostic tool for the coronal irradiance. Measurements of this observable as a function of the distance to the limb and its confrontation with radiative transfer modeling might give us valuable information on the physical properties of the solar atmosphere and on the amount of EUV radiation at relevant wavelengths penetrating the chromosphere from above.
Centeno Rebecca
Collados Manuel
Trujillo Bueno Javier
Uitenbroek Han
No associations
LandOfFree
The influence of coronal EUV irradiance on the emission in the He I 10830 A and D3 multiplets does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The influence of coronal EUV irradiance on the emission in the He I 10830 A and D3 multiplets, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The influence of coronal EUV irradiance on the emission in the He I 10830 A and D3 multiplets will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-623567