Solar Physics

, Volume 3, Issue 2, pp 321–343

Coronal polar plumes

  • Gordon NewkirkJr.
  • John Harvey
Article

Abstract

The purpose of this investigation was to determine what connection exists between coronal plumes and polar surface features. To this end the properties of plumes were re-examined by making a detailed statistical analysis of photographs of three eclipses (1962, 1963, and 1965) of the last sunspot minimum. It is found that a ‘typical’ plume has a core density ≈ 108 cm−3, a half width ≈ 3.3 × 104km, and a density profile with distance r from its axis characterized by
$$N \approx {\text{10}}^{\text{8}} \left( {1 - \frac{r}{{3.9 \times 10^4 }}} \right)^{1.6} $$

There is some (although only weak) regularity in the projected spacing of plumes with a mean separation of ≈ 7 × 104 km.

The relation between plumes and various surface features is examined. Although little direct evidence can be assembled, we conclude that a direct connection exists between plumes and photospheric faculae, bright K3 faculae, and the small-scale magnetic structure present in the chromospheric network. It is hypothesized that plumes originate at the bright cores of the rosettes which lie along the chromospheric network. The distribution of magnetic field in the corona above a surface covered with idealized chromospheric network cells is calculated. The fact that the shape and size of the magnetic flux tubes originating from the rosette agrees with that of observed plumes supports the hypothesis.

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References

  1. Allen, C. W.: 1963, Astrophysical Quantities. 2nd ed., Athlone Press, London.Google Scholar
  2. Beckers, J. M.: 1963, Astrophys. J. 138, 648.Google Scholar
  3. Beggs, D. W. and VonKluber, H.: 1964, Monthly Notices Roy. Astron. Soc. 127, 133.Google Scholar
  4. Blackman, R. B. and Tukey, J. W.: 1958, The Measurement of Power Spectra. Dover, New York.Google Scholar
  5. DeJager, C.: 1962, Space Sci. Rev. 1, 487.Google Scholar
  6. DeJager, C.: 1966, in Fine Structure of the Solar Atmosphere, (ed. by K. O. Kiepenheuer). Steiner Verlag, Wiesbaden.Google Scholar
  7. Fisher, R. R.: 1965, Power Spectrum Analysis of H-α Filtergrams. Thesis, University of Colorado, Boulder, Colo., U.S.A.Google Scholar
  8. Gillett, F. C., Stein, W. A., and Ney, E. P.: 1964, Astrophys. J. 140, 292.Google Scholar
  9. Granger, C. W. J. and Hatanaka, M.: 1964, Spectral Analysis of Economic Time Series. Princeton University Press.Google Scholar
  10. Harvey, J. W.: 1965, Astrophys. J. 141, 832.Google Scholar
  11. Howard, R.: 1959, Astrophys. J. 130, 193.Google Scholar
  12. Howard, R.: 1965, IAU Symposium No. 22, p. 133.Google Scholar
  13. Kulsrud, R. M.: 1955, Astrophys. J. 121, 461.Google Scholar
  14. Kuperus, M.: 1965, Rech. Astron. Obs. Utrecht 17, 1.Google Scholar
  15. Lee, Y. W.: 1960, Statistical Theory of Communication. Wiley, New York.Google Scholar
  16. Ney, E. P., Huch, W. F., Kellogg, P. J., Stein, W., and Gillett, F. C.: 1961, Astrophys. J. 133, 616.Google Scholar
  17. Nikolski, G. M.: 1956, Astron. Zh. 33, 87.Google Scholar
  18. Saito, K.: 1958, Publ. Astron. Soc. Japan 10, 49.Google Scholar
  19. Saito, K.: 1965, Publ. Astron. Soc. Japan 17, 1.Google Scholar
  20. Saito, K. and Tanaka, Y.: 1957a, Publ. Astron. Soc. Japan 9, 106.Google Scholar
  21. Saito, K. and Tanaka, Y.: 1957b, Publ. Astron. Soc. Japan 9, 210.Google Scholar
  22. Saito, K. and Tanaka, Y.: 1960, Publ. Astron. Soc. Japan 12, 556.Google Scholar
  23. Schmidt, H. U.: 1964, AAS-NASA Symposium on Physics of Solar Flares (ed. by. W. N. Hess). NASA SP-50, p. 107.Google Scholar
  24. Schmidt, H. U.: 1965, Min. Astron. Gesellschaft, Sept., 89.Google Scholar
  25. Schmidt, H. U.: 1966, Proceedings of the Meeting on Solar Magnetic Fields and High Resolution Spectroscopy. G. Barbera, Firenze, p. 233.Google Scholar
  26. Severny, A. B.: 1965, Sov. Astron. - AJ 9, 171.Google Scholar
  27. Sheeley, N. R., Jr.: 1964, Astrophys. J. 140, 731.Google Scholar
  28. Sheeley, N. R., Jr.: 1966, Astrophys. J. 144, 723.Google Scholar
  29. Sheeley, N. R., Jr.: 1967, Solar Phys. 1, 171.Google Scholar
  30. Simon, G. W. and Leighton, R. B.: 1964, Astrophys. J. 140, 1120.Google Scholar
  31. Stenflo, J. O.: 1966, Observatory 86, 73.Google Scholar
  32. Stoddard, L. G., Carson, D. G., and Saito, K.: 1966, Astrophys. J. 145, 796.Google Scholar
  33. Underwood, J. H. and Muney, W. S.: 1967, Solar Phys. 1, 129.Google Scholar
  34. Van DeHulst, H. C.: 1950, Bull. Astron. Inst. Neth. 11, 150.Google Scholar
  35. Van De Hulst, H. C.: 1953, in The Sun (ed. by G. Kuiper). University of Chicago Press.Google Scholar
  36. Waldmeier, M.: 1955a, Z. Astrophys. 38, 37.Google Scholar
  37. Waldmeier, M., 1955b, Z. Astrophys. 37, 233.Google Scholar

Copyright information

© D. Reidel Publishing Company 1968

Authors and Affiliations

  • Gordon NewkirkJr.
    • 1
  • John Harvey
    • 1
  1. 1.High Altitude ObservatoryBoulderU.S.A.

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