Solar Physics

, Volume 29, Issue 2, pp 505–525 | Cite as

A coronal hole and its identification as the source of a high velocity solar wind stream

  • A. S. Krieger
  • A. F. Timothy
  • E. C. Roelof


X-ray images of the solar corona, taken on November 24, 1970, showed a magnetically open structure in the low corona which extended from N20W20 to the south pole. Analysis of the measured X-ray intensities shows the density scale height within the structure to be typically a factor of two less than that in the surrounding large scale magnetically closed regions. The structure is identified as a coronal hole.

Since there have been several predictions that such a region should be the source of a high velocity stream in the solar wind, wind measurements for the appropriate period were traced back to the Sun by the method of instantaneous ideal spirals. A striking agreement was found between the Carrington longitude of the solar source of a recurrent high velocity solar wind stream and the position of the hole.

Solar wind bulk velocity and photospheric magnetic field data from the period 1962–1970 indicate the possible extension of the result to the interpretation of long term variations in the wind pattern.


Solar Wind Coronal Hole Solar Corona Scale Height Bulk Velocity 
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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Copyright information

© D. Reidel Publishing Company 1973

Authors and Affiliations

  • A. S. Krieger
    • 1
  • A. F. Timothy
    • 1
  • E. C. Roelof
    • 2
  1. 1.American Science and EngineeringCambridgeU.S.A.
  2. 2.University of New HampshireDurhamU.S.A.

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