3D heliospheric simulations of cosmic rays in the light of Ulysses

J. R. Jokipii, J. Kóta

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Recent Ulysses observations in the polar regions of the heliosphere have provided fundamental new insights into the modes of cosmic-ray transport in the heliosphere. Ulysses discovered variations in the magnetic field which are large enough to produce significant cosmic-ray effects, and which are consistent with a previous prediction. In addition to impeding the inward, radial diffusive and drift access of cosmic rays over the poles as discussed previously, the magnetic fluctuations imply a significantly larger latitudinal diffusion. These effects directly lead to both a much reduced latitudinal gradient and significant 27-day time variations near the pole. We conclude that the general picture of cosmic-ray transport and modulation developed over the past decade, with reasonable parameters, can account for most of the observed global, large-scale phenomena.

Original languageEnglish (US)
Pages (from-to)921-926
Number of pages6
JournalNuovo Cimento della Societa Italiana di Fisica C
Issue number6
StatePublished - 1996

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Physics and Astronomy (miscellaneous)


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