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Solar Physics

, Volume 69, Issue 2, pp 289–300 | Cite as

OSO-8 observations of CaII H and K, MgII h and k, Lα and Lβ above a sunspot

  • F. Kneer
  • G. Scharmer
  • W. Mattig
  • A. Wyller
  • G. Artzner
  • P. Lemaire
  • J. C. Vial
Article

Abstract

Observations with the French (L.P.S.P.) experiment on board OSO-8 of a sunspot and nearby plage region are described. The behaviour of the emission cores of the Ca II H and K and Mg II h and k resonance lines is very similar and the correspondence in intensity between the four lines persists in all observed features. In contrast, the Lyman lines show little correlation with the other lines. Their emission regions appear broader in the spectroheliograms than the underlying sunspot structure and must not necessarily possess a counterpart in lower layers. From the central intensity of Lα above the umbra an electron density of 4.3 × 1010 cm-3n e * ≲2.3 × 1011 cm-3 at 20 000 K is estimated.

Keywords

Lower Layer Central Intensity Resonance Line Emission Region Plage Region 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Artzner, G., Bonnet, R. M., Lemaire, P., Vial, J. C., Jouchoux, A., Leibacher, J., Vidal-Madjar, A., and Vite, M.: 1977, Space Sci. Instrum. 3, 131.Google Scholar
  2. Athay, R. G.: 1970, Solar Phys. 11, 347.Google Scholar
  3. Avrett, E. H. and Hummer, D. G.: 1965, Monthly Notices Roy. Astron. Soc. 130, 295.Google Scholar
  4. Basri, G. S., Linsky, J. L., Bartoe, J.-D. F., Brueckner, G., and van Hoosier, M. E.: 1979, Astrophys. J. 230, 924.Google Scholar
  5. Beckers, J. M. and Tallant, P. E.: 1969, Solar Phys. 7, 351.Google Scholar
  6. Bonnet, R. M., Lemaire, P., Vial, J. C., Artzner, G., Gouttebroze, P., Jouchoux, A., Leibacher, J., Skumanich, A., and Vidal-Madjar, A.: 1978, Astrophys. J. 221, 1032.Google Scholar
  7. Fredga, K.: 1971, Solar Phys. 21, 60.Google Scholar
  8. Gingerich, O., Noyes, R. W., Kalkofen, W., and Cuny, Y.: 1971, Solar Phys. 18, 347.Google Scholar
  9. Giovanelli, R. G., Harvey, J. W., and Livingston, W. C.: 1978, Solar Phys. 58, 347.Google Scholar
  10. Kneer, F. and Mattig, W.: 1978, Astron. Astrophys. 65, 17.Google Scholar
  11. Kohl, J. L. and Parkinson, W. H.: 1976, Astrophys. J. 205, 599.Google Scholar
  12. Lemaire, P., Charra, J., Jouchoux, A., Vidal-Madjar, A., Artzner, G., Vial, J. C., Bonnet, R. M., and Skumanich, A.: 1978, Astrophys. J. 223, L55.Google Scholar
  13. Linsky, J. L.: 1970, Solar Phys. 11, 355.Google Scholar
  14. Mattig, W. and Kneer, F.: 1978, Astron. Astrophys. 65, 11.Google Scholar
  15. Prinz, D. K.: 1974, Astrophys. J. 187, 369.Google Scholar
  16. Roberts, B.: 1976, Astrophys. J. 204, 268.Google Scholar
  17. Skumanich, A., Smythe, C., and Frazier, E. N.: 1975, Astrophys. J. 200, 747.Google Scholar
  18. Vernazza, J. E., Avrett, E. H., and Loeser, R.: 1973, Astrophys. J. 184, 605.Google Scholar
  19. Withbroe, G. L.: 1970, Solar Phys. 11, 42.Google Scholar
  20. Wittmann, A.: 1969, Solar Phys. 7, 366.Google Scholar

Copyright information

© D. Reidel Publishing Company 1981

Authors and Affiliations

  • F. Kneer
    • 1
  • G. Scharmer
    • 1
  • W. Mattig
    • 1
  • A. Wyller
    • 1
  • G. Artzner
    • 1
  • P. Lemaire
    • 1
  • J. C. Vial
    • 1
  1. 1.Kiepenheuer-InstitutFreiburgF.R.G.

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