Abstract
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.
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References
Altschuler, M. D. and Newkirk, G., Jr.: 1969, Solar Phys. 9, 131.
Altschuler, M. D. and Perry, R. M.: 1972, Solar Phys. 23, 410
Altschuler, M. D., Trotter, D. E., and Orrall, F. Q.: 1972, Solar Phys. 26, 354.
Billings, D. E. and Roberts, W. O.: 1964, Astrophys. Norveg. 9, 147.
Couturier, P. and Leblanc, Y.: 1970, Astron. Astrophys. 7, 254.
Davis, L.: 1965, in R. Lüst (ed.), Stellar and Solar Magnetic Fields, North Holland Publishing Co. Amsterdam, 204.
Goldstein, B. E.: 1971, ‘Nonlinear Corotating Solar Wind Structure’, MIT preprint CSR-P-71-63.
Gosling, J. T., Hansen, R. T., and Bame, S. J.: 1971, J. Geophys. Res. 76, 1811.
Gosling, J. T., Hundhausen, A. J., Pizzo, V., and Asbridge, J. R.: 1972, J. Geophys. Res. 77, 5442.
Hundhausen, A. J.: 1970, Rev. Geophys. Space Phys. 8, 729.
Krieger, A. S., Vaiana, G. S., and Van Speybroeck, L. P.: 1970, in R. Howard (ed.), ‘Solar Magnetic Fields’, IAU Symp. 43, 397.
Krimigis, S. M., Roelof, E. C., Armstrong, T. P., and Van Allen, J. A.: 1971, J. Geophys. Res. 76, 5921.
Lin, R. P.: 1970, Solar Phys. 15, 453.
Matsuda, T. and Sakurai, T.: 1972, Cosmic Electrodyn. 3, 97.
McIntosh, P. S.: 1972, Rev. Geophys. Space Sci. 10, 837.
Munro, R. H. and Withbroe, G. L.: 1972, ‘Properties of a Coronal Hole from EUV Observations’, Harvard College Observatory TR-31.
Newkirk, G., Jr. and Lacey, L.: 1970, Nature 226, 1098.
Nolte, J. T. and Roelof, E. C.: 1972, ‘Mapping of the Large Scale Interplanetary Field from Multi-spacecraft Solar Wind Data’ (abstract), EOS 53, 506, manuscript in preparation.
Parker, E. N.: 1963, Interplanetary Dynamical Processes, Interscience, New York.
Parker, E. N.: 1965, Space Sci. Rev. 4, 666.
Pathak, P. N.: 1971, Solar Phys. 20, 462.
Pneuman, G. W.: 1973, Solar Phys. 28, 247.
Pneuman, G. W. and Kopp, R. A.: 1971, Solar Phys. 18, 258.
Roelof, E. C.: 1972a, in C. Sonett, P. Coleman, and J. Wilcox (eds.), Solar Wind, NASA SP-308, Washington D. C., 140.
Roelof, E. C.: 1972b, ‘Isolated Coronal Sources of Enhanced Solar Wind Velocity’ (abstract), EOS 53, 506, manuscript in preparation.
Roelof, E. C. and Krimigis, S. M.: 1972, ‘Analysis and Synthesis of Solar and Interplanetary Energetic Particles, Plasma and Magnetic Field Observations over Three Solar Rotations’, submitted to J. Geophys. Res. (preprint, Applied Physics Laboratory, The Johns Hopkins University).
Sakurai, T.: 1971, Cosmic Electrodyn. 1, 460.
Snyder, C. W. and Neugebauer, M.: 1966, in R. J. Mackin (ed.), The Solar Wind, Pergamon Press.
Stenflo, J. O.: 1972, Solar Phys. 23, 307.
Tucker, W. H. and Koren, M.: 1971, Astrophys. J. 168, 283.
Vaiana, G. S.: 1970, ‘Methods of Imaging X-ray Astronomy and the X-ray Spectroheliograph on ATM’, ASE-2595.
Van Speybroeck, L. P., Krieger, A. S., and Vaiana, G. S.: 1970, Nature 227, 818.
Weber, E. J. and Davis, L., Jr.: 1967, Astrophys. J. 148, 217.
Wilcox, J. M.: 1968, Space Sci. Rev. 8, 258.
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Krieger, A.S., Timothy, A.F. & Roelof, E.C. A coronal hole and its identification as the source of a high velocity solar wind stream. Sol Phys 29, 505–525 (1973). https://doi.org/10.1007/BF00150828
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DOI: https://doi.org/10.1007/BF00150828