- Physical Review Journals
All JournalsPhysics Magazine
All JournalsPhysics Magazine
Access Provided by Xinjiang University

Physical Review Journals Archive

Export citation

Export citation

Choose format for download:

Download Citation
  • Access by Xinjiang University

A Study of Time Variations in the Cosmic-Ray Directional Intensity Distribution

Max L. Yeater*

  • Department of Physics, Washington University, St. Louis, Missouri

  • *Now at the Radiation Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts.
PDF

Phys. Rev. 67, 74 – Published 1 February, 1945

DOI: https://doi.org/10.1103/PhysRev.67.74

Abstract

Evidence of time variations in the cosmic-ray directional intensity distribution has been obtained, by a statistical analysis of directional intensity measurements carried out at St. Louis in 1943. The variations, occurring within periods of twelve to twenty-eight hours, seem most pronounced near zenith angles of ±20° and ±70° in the east-west plane, and are not found in the north-south plane. These observations would appear to be explained by the effect of terrestrial magnetic fluctuations in modifying the allowed cones of certain primary cosmic-ray particles, these particles having energies grouped near 0.2 Störmer and 0.6 Störmer. If this hypothesis is correct, the east-west positional symmetry of these variations constitutes new evidence, supporting previous evidence of Schremp, that positive and negative particles with the same em exist in the primary cosmic radiation. Earlier results of Ribner, Cooper, and Schremp, on the static fine structure pattern of cosmic-ray directional intensity, are also supported by the present data. The time variations in the intensity distribution reported here are variations in the fine structure pattern, but appear to be independent of the static prominences previously reported. The method for rapid exploration of the cosmic-ray directional intensity distribution is described. The multidirectional cosmic-ray telescope used is discussed in some detail.

View figure in article

References (35)

  1. M. S. Vallarta, J. Frank. Inst. 227, 1 (1939) E. J. Schremp, Phys. Rev. 54, 157 (1938) R. Albagli Hutner, 55, 15 and 614 (1939)
  2. E. J. Schremp, Phys. Rev. 53, 915A (1938)
  3. E. J. Schremp, Phys. Rev. 54, 157 (1939)
  4. E. J. Schremp and H. S. Ribner, Rev. Mod. Phys. 11, 149 (1939)
  5. H. S. Ribner, Phys. Rev. 56, 1069 (1939)
  6. D. M. Cooper, Phys. Rev. 58, 288 (1940)
  7. E. J. Schremp and Alfredo Baños, Jr., Phys. Rev. 59, 614 (1941)
  8. [4], p. 150
  9. [7]
  10. [4–6]
  11. [4–6]
  12. Adolf Trost, Zeits. f. Physik 105, 399 (1937)
  13. M. L. Yeater, Rev. Sci. Inst. 14, 146 (1943)
  14. A. L. Hughes, Am. Phys. T. 7, 271 (1939)
  15. B. Rossi, Nature 125, 636 (1930)
  16. T. H. Johnson, Rev. Sci. Inst. 9, 221 (1938)

  17. Omitted endnote

  18. Gunnar Dahlberg, Statistical Methods for Medical and Biological Students (George Allen and Unwin, London, 1940), Chap. VIII T. C. Fry, Probability and Its Engineering Uses (McGraw-Hill Book Company, Inc., New York, 1928)
  19. Fry, [18], p. 285
  20. Karl Pearson, Tables for Statisticians and Biometricians (Cambridge University Press, London, 1930), third edition, Part I, p. 26
  21. [5]
  22. [6]
  23. [4,6,7]

  24. Omitted endnote

  25. Omitted endnote

  26. Fry, [18]
  27. Terr. Mag. 48, 117, 188 (1943)
  28. [4,6,7]

  29. Omitted endnote

  30. Omitted endnote

  31. [27]
  32. E. J. Schremp, Phys. Rev. 54, 169 (1938)
  33. [32]
  34. [7]
  35. [13]

Outline

Information

Phys. Rev. 67, 74– Published 1 February, 1945
  • Received 13 October 1944

© 1945 American Physical Society

Sign In to Your Journals Account

Filter

Filter

Article Lookup

Enter a citation