Three-dimensional cosmic-ray simulations: Heliographic latitude and current-sheet tilt

J. R. Jokipii, J. Kóta

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


We present the results from a study of the variations of the cosmic-ray intensity with time, heliographic latitude, and longitude, and for varying interplanetary conditions, using our three-dimensional, time-dependent computer code for cosmic-ray transport in the heliosphere. Our code also produces a solar-wind and interplanetary magnetic field (IMF) configuration which is compared with observations. Because of the fully threedimensional nature of the model calculations, we are able to model time variations which would be expected to be observed along Ulysses's trajectory as it moves to high latitudes. In particular we can model the approximately 13-and 26-day solar-rotation induced variations in cosmic rays, solar wind and IMF, as a function of increasing heliographic latitude, as one moves poleward of the interplanetary current sheet. Our preliminary model results seem to be in general form quite similar to published data, but depend on the physical parameters used such as cosmic-ray diffusion coefficients, boundary conditions, and the nature of the solar wind and IMF and current sheet.

Original languageEnglish (US)
Pages (from-to)379-384
Number of pages6
JournalSpace Science Reviews
Issue number1-2
StatePublished - Apr 1995


  • Cosmic-Rays
  • Heliosphere
  • Modulation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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