Solar Physics

, Volume 107, Issue 1, pp 63–72

Shifts of the Caii K line in Hei 10830 dark points

  • Rush D. Holt
  • D. J. Mullan
Article

Abstract

We investigate the velocity field of the solar chromosphere at the location of 65 He i 10830 dark points (DP's). We have obtained spectra of such points in the vicinity of the Ca II K line. As a measure of differential chromospheric velocity, we use the shift of the K line center relative to a nearby photospheric Fe i line. We find that in He i DP's, the distribution of K line shifts is skewed towards the blue: the blueward skewing is more pronounced in He i DP's located in coronal holes. To the extent that He i DP's are proxies of coronal bright points, our study is relevant to previous reports of outflows from such bright points.

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References

  1. Ahmad, I. A. and Webb, D. B.: 1978, Solar Phys. 58, 323.Google Scholar
  2. Athay, R. G.: 1981, in S. Jordan (ed.), The Sun as a Star, NASA SP-450, p. 113.Google Scholar
  3. Brueckner, G. E. and Bartoe, J. D. F.: 1983, Astrophys. J. 272, 329.Google Scholar
  4. Cram, L. E.: 1976, Astron. Astrophys. 50, 263.Google Scholar
  5. Davis, J. M.: 1980, Bull. Amer. Astron. Soc. 12, 518.Google Scholar
  6. Dere, K. P.: 1983, in M. Neugebauer (ed.), Solar Wind Five, NASA Conf. Publ. 2280, Washington DC, p. 33.Google Scholar
  7. Harvey, K. L.: 1984, in The Hydromagnetics of the Sun, ESA SP-220, Noordwijkerhout, The Netherlands, p. 235.Google Scholar
  8. Harvey, K. L.: 1985a, Australian J. Phys. 38, 875.Google Scholar
  9. Harvey, K. L: 1985b, Final Report, AFGL-TR-84-0335.Google Scholar
  10. Harvey, J. W. and Sheeley, N. R.: 1977, Solar Phys. 54, 343.Google Scholar
  11. Harvey, J. W., Krieger, A. S., Timothy, A. F., and Vaiana, G. S.: 1974, Obser. Mem. Arcetri 104, 50.Google Scholar
  12. Holt, R. D., Harvey, K. L., and Recely, F.: 1986, in preparation.Google Scholar
  13. Kahler, S. W., Davis, J. M., and Harvey, J. W., 1983, Solar Phys. 87, 47.Google Scholar
  14. Liu, S, Y. and Smith, E. v. P.: 1972, Solar Phys. 24, 301.Google Scholar
  15. Livingston, W. C., Harvey, J. W., Slaughter, C. D., and Trumbo, D.: 1976, Appl. Optics 15, 40.Google Scholar
  16. Moore, R., Tang, F., Bohlin, R., and Golub, L.: 1977, Astrophys. J. 218, 286.Google Scholar
  17. Rabin, D. and Moore, R. L.: 1980, Astrophys. J. 241, 394.Google Scholar
  18. Schmitt, J.: 1985, Astrophys. J. 293, 178.Google Scholar
  19. Vernazza, J. E., Avrett, E. H., and Loeser, R.: 1981, Astrophys. J. Suppl. 45, 637.Google Scholar
  20. Wyller, A. A. and Fay, T. D.: 1972, Appl. Optics 11, 1152.Google Scholar
  21. Zirker, J.: 1981, in S. Jordan (ed.), The Sun as a Star, NASA SP-450, p. 145.Google Scholar

Copyright information

© D. Reidel Publishing Company 1986

Authors and Affiliations

  • Rush D. Holt
    • 1
  • D. J. Mullan
    • 2
  1. 1.Physics DepartmentSwarthmore CollegeSwarthmoreU.S.A.
  2. 2.Bartol Research Foundation of the Franklin Institute, University of DelawareNewarkU.S.A.

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