Advertisement

Solar Physics

, Volume 70, Issue 2, pp 237–249 | Cite as

Coronal holes, solar wind streams, and geomagnetic disturbances during 1978 and 1979

  • N. R. SheeleyJr.
  • J. W. Harvey
Article

Abstract

We have extended our long-term study of coronal holes, solar wind streams, and geomagnetic disturbances through the rising phase of sunspot cycle 21 into the era of sunspot maximum. During 1978 and 1979, coronal holes reflected the influence of differential rotation, and existed within a slowly-evolving large-scale pattern despite the relatively high level of sunspot activity. The long-lived 28.5-day pattern is not produced by a rigidly-rotating quasi-stationary structure on the Sun, but seems to be produced by a non-stationary migratory process associated with solar differential rotation. The association between coronal holes and solar wind speed enhancements at Earth continues to depend on the latitude of the holes (relative to the heliographic latitude of Earth), but even the best associations since 1976 have speeds of only 500–600 km s-1 rather than the values of 600–700 km s-1 that usually occurred during the declining phase of sunspot cycle 20.

Keywords

Wind Speed Solar Wind Coronal Hole Migratory Process Differential Rotation 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Bohlin, J. D.: 1976, in D. J. Williams (ed.), Physics of Solar Planetary Environments, Vol. I, Am. Geophys. Union., p. 114.Google Scholar
  2. Bohlin, J. D.: 1977, Solar Phys. 51, 377.Google Scholar
  3. Bohlin, J. D. and Sheeley, Jr., N. R.: 1978, Solar Phys. 56, 125.Google Scholar
  4. Harvey, J. W. and Sheeley, Jr., N. R.: 1979, Space Sci. Rev. 23, 139.Google Scholar
  5. Harvey, K., Sheeley, Jr., N. R., and Harvey, J.: 1980, Bull. Am. Astron. Soc. 12, 503.Google Scholar
  6. Hundhausen, A. J.: 1977, in J. Zirker (ed.), Coronal Holes and High Speed Wind Streams, Colorado Associated University Press, Boulder, p. 325.Google Scholar
  7. Kopp, R. A. and Pneuman, G. W.: 1976, Solar Phys. 50, 85.Google Scholar
  8. Rust, D. M.: 1978, AS & E Preprint No. 4318 (submitted to Solar Phys., August 1978).Google Scholar
  9. Sheeley, Jr., N. R.: 1980, Solar Phys. 65, 229.Google Scholar
  10. Sheeley, Jr., N. R. and Harvey, J. W.: 1978, Solar Phys. 59, 159.Google Scholar
  11. Sheeley, Jr., N. R., Bohlin, J. D., Brueckner, J. E., Purcell, J. D., Scherrer, V. E., and Tousey, R.: 1975, Solar Phys. 40, 103.Google Scholar
  12. Sheeley, Jr., N. R., Harvey, J. W., and Feldman, W. C.: 1976, Solar Phys. 49, 271.Google Scholar
  13. Sheeley, Jr., N. R., Asbridge, J. R., Bame, S. J., and Harvey, J. W.: 1977, Solar Phys. 52, 485.Google Scholar
  14. Solodyna, C. V., Krieger, A. S., and Nolte, J. T.: 1977, Solar Phys. 54, 123.Google Scholar
  15. Solar-Geophysical Data (prompt reports): 1979, Data for 1979, U.S. Department of Commerce, Boulder, Colorado.Google Scholar
  16. Svalgaard, L.: 1978, private communication.Google Scholar
  17. Svalgaard, L. and Wilcox, J. M.: 1975, Solar Phys. 41, 461.Google Scholar
  18. Webb, D. F., McIntosh, P. S., Nolte, J. T., and Solodyna, C. V.: 1978, Solar Phys. 58, 389.Google Scholar

Copyright information

© D. Reidel Publishing Co 1981

Authors and Affiliations

  • N. R. SheeleyJr.
    • 1
  • J. W. Harvey
    • 2
  1. 1.E. O. Hulburt Center for Space Research, U.S. Naval Research LaboratoryWashington, D.C.U.S.A.
  2. 2.Kitt Peak National ObservatoryTucsonU.S.A.

Personalised recommendations