A new calculation of the cosmic-ray antiproton spectrum in the Galaxy and heliospheric modulation effects on this spectrum using a drift plus wavy current sheet model

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Antiprotons, Astronomical Spectroscopy, Cosmic Rays, Galactic Radiation, Particle Acceleration, Astronomical Models, Current Sheets, Heliosphere, Interstellar Matter, Milky Way Galaxy

Scientific paper

The expected interstellar antiproton spectrum arising from cosmic-ray interactions in the Galaxy is recalculated, and the modulation of both antiprotons and protons is calculated using a two-dimensional modulation model incorporating gradient and curvature drifts and a wavy current sheet as well as the usual diffusion, convection, and energy-loss effects. Significant differences in the antiproton/proton ratio for different solar magnetic field polarities are predicted as well as a 'low-energy' component for antiprotons below about 1 GeV.

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