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

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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
Volume19
Issue number6
StatePublished - Nov 1996

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cosmic rays
heliosphere
poles
simulation
daytime
polar regions
modulation
gradients
predictions
magnetic fields

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Astronomy and Astrophysics

Cite this

3D heliospheric simulations of cosmic rays in the light of Ulysses. / Jokipii, J. Randy; Kóta, J.

In: Nuovo Cimento della Societa Italiana di Fisica C, Vol. 19, No. 6, 11.1996, p. 921-926.

Research output: Contribution to journalArticle

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