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Sunspot umbra atmosphere from full Stokes inversion

Authors
  • Wenzel, R.
  • Berdyugina, S. V.
  • Fluri, D. M.
  • Arnaud, J.
  • Sainz-Dalda, A.
Type
Preprint
Publication Date
Mar 26, 2010
Submission Date
Mar 26, 2010
Source
arXiv
License
Yellow
External links

Abstract

Sunspots are prominent manifestations of the solar cycle and provide key constraints for understanding its operation. Also, knowing internal structure of sunspots allows us to gain insights on the energy transport in strong magnetic fields and, thus, on the processes inside the convection zone, where solar magnetic fields are generated and amplified before emerging at the surface on various scales, even during solar minima. In this paper, we present results of a spectropolarimetric analysis of a sunspot observed during the declining phase of the solar cycle 23. By inversion of full Stokes spectra observed in several spectral regions in the optical at the THEMIS facility we infer the height dependence of physical quantities such as the temperature and the magnetic field strength for different sunspot regions. The simultaneous use of atomic (Fe{\sc i} 5250.2 and 5250.6 \AA) and highly temperature sensitive molecular (TiO 7055 \AA and MgH 5200 \AA) lines allow us to improve a model of the sunspot umbra.

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