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Space Science Reviews

, Volume 72, Issue 1–2, pp 403–408 | Cite as

Ulysses out-of-ecliptic observations of “27-day” variations in high energy cosmic ray intensity

  • R. B. Mckibben
  • J. A. Simpson
  • M. Zhang
  • S. Bame
  • A. Balogh
Session 4: Cosmic Rays in the Heliosphere

Abstract

We report the discovery that for latitudes above ∼40°S, the observed recurring modulation of cosmic rays and anomalous nuclei occurs without the detection byUlysses of the solar wind velocity and magnetic field recurring enhancements that have, heretofore at lower latitudes, defined corotating interaction regions—i.e., the mechanism producing the recurring intensity variations >40°S appears to be located beyond the radial range ofUlysses.

Keywords

Magnetic Field Solar Wind Wind Velocity Lower Latitude Intensity Variation 
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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References

  1. Bastian, T.S., McKibben, R.B., Simpson, J.A.: 1979, ‘Recurrent modulation of galactic cosmic rays and the anomalous helium’,Proc. 16th Int'l Cosmic Ray Conf.,12, 324.Google Scholar
  2. Barnes, C.W., Simpson, J.A.: 1976 ‘Evidence for interplanetary acceleration of nucleons in corotating interaction regions’,Astrophys. J. (Letters),210, L91.Google Scholar
  3. Fonger, W.H.: 1953, ‘Cosmic ray intensity-time variations and their origin, II. energy dependence of 27-Day variations’,Phys. Rev. 91, 351.Google Scholar
  4. Jokipii, J.R., Kopriva, D.A.: 1979, ‘Effects of particle drift on the transport of cosmic rays’,Astrophys. J.,234, 384.Google Scholar
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  7. Sanderson, T.R., et al.: 1994, ‘Ulysses high-latitude observations of ions accelerated by corotating interaction regions’,J. Geophys. Res, in press.Google Scholar
  8. Simpson, J.A.: 1954, ‘Cosmic radiation intensity-time variation and their origin: III the origin of 27-day variations’,Phys. Rev.,94, 425.Google Scholar
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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • R. B. Mckibben
    • 1
  • J. A. Simpson
    • 1
  • M. Zhang
    • 1
  • S. Bame
    • 2
  • A. Balogh
    • 3
  1. 1.Enrico Fermi InstituteThe University of ChicagoChicagoUSA
  2. 2.Los Alamos National LaboratoryLos AlamosUSA
  3. 3.Blackett LaboratoryImperial College of Science, Technology and MedicineUK

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