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An LTE Code for the Inversion of Stokes Spectra from Solar Magnetic Elements

  • L. R. Bellot Rubio
  • B. Ruiz Cobo
  • M. Collados
Part of the Astrophysics and Space Science Library book series (ASSL, volume 243)

Abstract

We describe an LTE inversion code capable of inferring the thermal, magnetic and dynamic properties of unresolved magnetic elements. This information is obtained by fitting Stokes spectra observed in active region faculae and the quiet sun network. Our code implements the simplest two-component model of solar magnetic elements, namely the thin flux tube model. The geometry of such tubes is fully taken into account for the computation of synthetic Stokes spectra. The code makes extensive use of the so-called response functions, and employs a nonlinear least-squares Marquardt algorithm to solve the problem of minimizing the sum of squared differences between the observed and computed profiles. One of the main advantages of our inversion code with respect to previous diagnostic techniques is that it is able to deal with arbitrary stratifications of the physical parameters which determine the structure of the flux tubes. In this paper, results of some numerical simulations aimed at characterizing the behavior of the code are presented.

Key words

Line profiles polarization magnetic fields radiative transfer faculae 

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References

  1. Bellot Rubio, L.R., Ruiz Cobo, B., & Collados, M.: 1996, A&A 306, 960ADSGoogle Scholar
  2. Bellot Rubio, L.R., Ruiz Cobo, B., & Collados, M.: 1997, ApJ, 478, L45ADSCrossRefGoogle Scholar
  3. Bellot Rubio, L.R., Ruiz Cobo, B., & Collados, M.: 1998, ApJ, 506, 805ADSCrossRefGoogle Scholar
  4. Bellot Rubio, L.R., Ruiz Cobo, B., & Collados, M.: 1999a, ApJ, submittedGoogle Scholar
  5. Bellot Rubio, L.R., Ruiz Cobo, B., & Collados, M.: 1999b, A&A, 341, L31ADSGoogle Scholar
  6. Bellot Rubio, L.R., Ruiz Cobo, B., & Collados, M.: 1999c, in: High Resolution Solar Physics: Theory, Observations and Techniques, Proc. of the 19th NSO/Sacramento Peak Summer Workshop, eds. T. Rimmele, K.S. Balasubramanian, & R. Radick, ASP Conference Series, in pressGoogle Scholar
  7. Elmore, D.F., et al.: 1992, Proc. SPIE, 1746, 22ADSCrossRefGoogle Scholar
  8. Gingerich, O., Noyes, R. W., Kalkofen, W., & Cuny, Y.: 1971, Solar Phys., 18, 347ADSCrossRefGoogle Scholar
  9. Holweger, H., & Müller, E.A.: 1974, Solar Phys., 39, 19ADSCrossRefGoogle Scholar
  10. Keller, C.U., Solanki, S.K., Steiner, O., & Stenflo, J.O.: 1990, A&A, 233, 583ADSGoogle Scholar
  11. Press, W. H., Flannery, B. P., Teukolsky, S. A., & Vetterling, W. T.: 1986 Numerical Recipes, Cambridge University Press, CambridgeGoogle Scholar
  12. Rodríguez Hidalgo, I., Ruiz Cobo, B., del Toro Iniesta, J.C., Collados, M., & Sánchez Almeida, J.: 1995, in: JOSO Annual Report 1995, ed. M. Saniga, Astronomical Insti tute, Tatranská LomnicaGoogle Scholar
  13. Ruiz Cobo, B. & del Toro Iniesta, J.C.: 1992, ApJ, 398, 375ADSCrossRefGoogle Scholar
  14. Ruiz Cobo, B., Bellot Rubio L.R., & Collados, M.: 1999, in K.N. Nagendra, J.O. Stenflo (eds.), Solar Polarization, Proc. 2nd SPW, Kluwer, Dordrecht, (in this Volume).Google Scholar
  15. Sánchez Almeida, J., & Martinez Pillet, V.: 1994, ApJ, 424, 1014ADSCrossRefGoogle Scholar
  16. Skumanich, A., & Lites, B.W.: 1987, ApJ, 332, 473ADSCrossRefGoogle Scholar
  17. Spruit, H.C.: 1976, Solar Phys., 50, 269ADSCrossRefGoogle Scholar
  18. del Toro Iniesta, J.C., & Ruiz Cobo, B.: 1997, in Forum Themis. Science with Themis, eds. N. Mein & S. Sahal-Bréchot, Publication of Paris Observatory, 93Google Scholar
  19. del Toro Iniesta, J.C., Ruiz Cobo, B., Bellot Rubio, L.R., & Collados, M.: 1995, A&A, 294, 855ADSGoogle Scholar
  20. Wittmann, A.: 1974, Solar Phys., 35, 11ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 1999

Authors and Affiliations

  • L. R. Bellot Rubio
    • 1
  • B. Ruiz Cobo
    • 1
  • M. Collados
    • 1
  1. 1.Instituto de Astrofísica de CanariasLa Laguna, TenerifeSpain

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