| Presenter: | Hector Socas-Navarro |
| Affiliation: | High Altitude Observatory |
| Title: | Can polarimetric observations help resolve the solar oxygen crisis? |
| Authors: | H. Socas-Navarro, A.A. Norton, R. Centeno |
| Form: | talk |
| Abstract: | Oxygen is the third most abundant element in the universe and a precise knowledge of its abundance is crucial in solar and stellar astrophysics. Recently, more sophisticated (3D) modeling of the solar atmosphere has forced a downwards revision of its oxygen abundance by almost a factor two. Here we present results from a novel approach to the analysis of the O~{\sc{i}} multiplet at 777 nm using a new 3D semiempirical model. We also intend to present results from spectro-polarimetric observations of the forbidden [O~{\sc{i}}] line at 630 nm in a sunspot which, as we will show, should allow for a much more reliable determination of the oxygen abundance. |
| Session: | 3. Nature of solar magnetic fields as revealed by polarimetry |
| Presentation date: | Tuesday 18th September |
| Presentation time: | 11:45:00 |