A new model to study galactic cosmic ray modulation in an asymmetrically bounded heliosphere

Details A new model to study galactic cosmic ray modulation in an asymmetrically bounded heliosphere A new model to study galactic cosmic ray modulation in an asymmetrically bounded heliosphere

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...103.2099h&link_type=abstract

Journal of Geophysical Research, vol. 103, p. 2099

Astronomy and Astrophysics

Astronomy

15

Galactic Cosmic Rays, Heliosphere, Two Dimensional Models, Plasma Drift, Neutral Sheets, Solar Wind, Transport Properties, Astronomical Models, Plasma Diffusion, Spatial Distribution, Magnetic Fields, Energy Distribution

Scientific paper

We developed a 2D steady state numerical model that can describe the modulation of galactic cosmic rays in an arbitrarily shaped heliospheric outer modulation boundary. The model is based on the well-known Parker transport equation for cosmic rays and incorporates: gradient and curvature drift effects including drift along a wavy neutral sheet; adiabatic energy changes; diffusion parallel and anisotropic diffusion perpendicular to the heliospheric magnetic field; and outward convection due to a latitude-dependent expanding solar wind plasma. The model is described together with results illustrating the effects of an asymmetric heliospheric boundary on the spatial and energy variations of galactic cosmic ray protons throughout the heliosphere. The cosmic ray distribution in the inner heliosphere was only marginally altered, but significant changes were found beyond about 30 AU, especially in the upwind direction.

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