Skip to main content
SpringerLink
Log in

Origin of the weakening of EUV emission lines formed in the chromosphere-corona transition zone

  • Published:
Solar Physics Aims and scope Submit manuscript

Abstract

EUV spectroheliograms of the quiet Sun obtained with the Harvard experiment on Skylab are analyzed to identify the structure causing the weakening of the EUV line emission due to Lyman continuum absorption. The weakening at the network boundaries can be explained by overlapping of several spicules each of which being wrapped in an EUV emitting sheath. Part of the cell interiors show moderate weakening, this has the shape of a belt surrounding the network boundaries. There are a number of patches showing intense weakening near network boundaries and in cell interiors; the weakening at the points cannot be explained by overlapping of chromospheric structures with an EUV emitting sheath. A possible explanation is that the intense weakening is caused by cool chromospheric clouds or moving blobs over the EUV emitting sources in the cell interiors. Some of the points showing intense weakening are associated with an enhancement of the EUV emission. These points have lifetime shorter than the time interval of 5.5 min between successive observations, which stresses again that the chromosphere-corona transition zone is in a dynamic state.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  • Athay, R. G.: 1976, The Solar Chromosphere and Corona: Quiet Sun, D. Reidel Publ. Co., Dordrecht, Holland.

    Google Scholar 

  • Basri, G. S., Linsky, J. L., Bartoe, J.-D. F., Brueckner, G. E., and VanHoosier, M. E.: 1979, Astrophys. J. 230, 924.

    Google Scholar 

  • Beckers, J. M.: 1972, Ann. Rev. Astron. Astrophys. 10, 73.

    Google Scholar 

  • Bonnet, R. M.: 1978, Space Sci. Rev. 21, 379.

    Google Scholar 

  • Bonnet, R. M.: 1979, in M. J. Rycroft (ed.), Space Research, Vol. XX, Pergamon Press.

  • Bonnet, R. M.: 1981, Space Sci. Rev. 29, 131.

    Google Scholar 

  • Bonnet, R. M. and Tsiropoula, G.: 1982, Solar Phys. 75, 139.

    Google Scholar 

  • Bonnet, R. M., Bruner Jr., E. C., Acton, L. W., Brown, W. A., and Decaudin, M.: 1980, Astrophys. J. 237, L47.

    Google Scholar 

  • Brueckner, G. E.: 1980, Highlights of Astronomy 5, 557.

    Google Scholar 

  • Dere, K. P., Bartoe, J.-D. F., Brueckner, G. E., Dykton, M. D., and VanHoosier, M. E.: 1981, Astrophys. J. 249, 333.

    Google Scholar 

  • Donnelly, R. F. and Hall, L. A.: 1973, Solar Phys. 31, 411.

    Google Scholar 

  • Donnelly, R. F. and Kane, S. R.: 1978, Astrophys. J. 222, 1043.

    Google Scholar 

  • Donnelly, R. F., Wood Jr., A. T., and Noyes, R. W.: 1973, Solar Phys. 29, 107.

    Google Scholar 

  • Doschek, G. A. and Feldman, U.: 1982, Astrophys. J. 254, 371.

    Google Scholar 

  • Doschek, G. A., Feldman, U., and Bohlin, J. D.: 1976, Astrophys. J. 205, L177.

    Google Scholar 

  • Dupree, A. K.: 1972, Astrophys. J. 178, 527.

    Google Scholar 

  • Feldman, U., Doschek, G. A., and Mariska, J. T.: 1979, Astrophys. J. 229, 369.

    Google Scholar 

  • Foukal, P. V.: 1976, Astrophys. J. 210, 575.

    Google Scholar 

  • Foukal, P. V.: 1978, Astrophys. J. 223, 1046.

    Google Scholar 

  • Foukal, P. V.: 1981, Astrophys. J. 245, 304.

    Google Scholar 

  • Funakoshi, Y. and Kanno, M.:1979, private communication.

  • Gabriel, A. H.: 1976, Phil. Trans. Roy. Soc. London A281, 339.

    Google Scholar 

  • Jordan, C.: 1969, Monthly Notices Roy. Astron. Soc. 142, 501.

    Google Scholar 

  • Jordan, C.: 1975, Monthly Notices Roy. Astron. Soc. 170, 429.

    Google Scholar 

  • Kane, S. R. and Donnelly, R. F.: 1971, Astrophys. J. 164, 151.

    Google Scholar 

  • Kanno, M.: 1978, Publ. Astron. Soc. Japan 30, 581.

    Google Scholar 

  • Kanno, M.: 1979, Publ. Astron. Soc. Japan 31, 115.

    Google Scholar 

  • Kanno, M. and Nishikawa, T.: 1978, Publ. Astron. Soc. Japan 30, 353.

    Google Scholar 

  • Kanno, M. and Suematsu, Y.: 1982, Publ. Astron. Soc. Japan 34, 449.

    Google Scholar 

  • Kanno, M., Withbroe, G. L., and Noyes, R. W.: 1981, Solar Phys. 69, 313.

    Google Scholar 

  • Lites, B. W.: 1981, Solar Phys. 71, 329.

    Google Scholar 

  • Mariska, J. T.: 1977, Ph. D. Thesis, Harvard University.

  • Mariska, J. T., Feldman, U., and Doschek, G. A.: 1978, Astrophys. J. 226, 698.

    Google Scholar 

  • Nishikawa, T. and Kanno, M.: 1979, Publ. Astron. Soc. Japan 31, 563.

    Google Scholar 

  • Noyes, R. W., Withbroe, G. L., and Kirshner, R. P.: 1970, Solar Phys. 11, 388.

    Google Scholar 

  • Orrall, F. Q. and Schmahl, E. J.: 1976, Solar Phys. 50, 365.

    Google Scholar 

  • Pneuman, G. W. and Kopp, R. A.: 1978, Solar Phys. 57, 49.

    Google Scholar 

  • Pottasch, S. R.: 1964, Space Sci. Rev. 3, 816.

    Google Scholar 

  • Pottasch, S. R.: 1967, Bul. Astron. Inst. Netherlands 19, 113.

    Google Scholar 

  • Raymond, J. C.: 1979, private communication.

  • Raymond, J. C. and Doyle, J. G.: 1981, Astrophys. J. 247, 686.

    Google Scholar 

  • Reeves, E. M.: 1976, Solar Phys. 46, 53.

    Google Scholar 

  • Schmahl, E. J.: 1981, Solar Phys. 69, 135.

    Google Scholar 

  • Schmahl, E. J. and Orrall, F. Q.: 1979, Astrophys. J. 231, L41.

    Google Scholar 

  • Schmahl, E. J., Foukal, P. V., Huber, M. C. E., Noyes, R. W., Reeves, E. M., Timothy, J. G., Vernazza, J. E., and Withbroe, G. L.: 1974, Solar Phys. 39, 337.

    Google Scholar 

  • Sheeley Jr., N. R.: 1980, Solar Phys. 66, 79.

    Google Scholar 

  • Shibata, K., Nishikawa, T., Kitai, R., and Suematsu, Y.: 1982, Solar Phys. 77, 121.

    Google Scholar 

  • Skumanich, A., Smythe, C., and Frazier, E. N.: 1975, Astrophys. J. 200, 747.

    Google Scholar 

  • Suematsu, Y., Shibata, K., Nishikawa, T., and Kitai, R.: 1982, Solar Phys. 75, 99.

    Google Scholar 

  • Steinolfson, R. S., Schmahl, E. J., and Wu, S. T.: 1979, Solar Phys. 63, 187.

    Google Scholar 

  • Vernazza, J. E. and Reeves, E. M.: 1978, Astrophys. J. Suppl. 37, 485.

    Google Scholar 

  • Withbroe, G. L.: 1970a, Solar Phys. 11, 42.

    Google Scholar 

  • Withbroe, G. L.: 1970b, Solar Phys. 11, 208.

    Google Scholar 

  • Withbroe, G. L.: 1976, Center for Astrophysics, Preprint No. 524.

  • Withbroe, G. L.: 1977, in E. Hansen and S. Schaffner (eds.), Proceedings of the November 7–10,1977 OSO-8 Workshop, p. 2.

  • Withbroe, G. L. and Mariska, J. T.: 1976, Solar Phys. 48, 21.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Department of Astronomy, Faculty of Science, University of Kyoto, 606, Kyoto, Japan

    Takara Nishikawa

Authors
  1. Takara Nishikawa
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Nishikawa, T. Origin of the weakening of EUV emission lines formed in the chromosphere-corona transition zone. Sol Phys 85, 65–82 (1983). https://doi.org/10.1007/BF00148258

Download citation

  • Received:

  • Revised:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00148258

Keywords

Search

Navigation