a New Concept of Cosmic Ray Diffusion in the Heliosheath

Physics – Plasma Physics

Scientific paper

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[2104] Interplanetary Physics / Cosmic Rays, [2124] Interplanetary Physics / Heliopause And Solar Wind Termination, [7811] Space Plasma Physics / Discontinuities, [7859] Space Plasma Physics / Transport Processes

Scientific paper

Even during periods near solar minima the magnetic field structure in the distant heliosheath is dominated by the warped neutral sheet that is stretched in latutudinal direction by nonradial plasma flows. The width of each alternating polarity magnetic sector rapidly decreases with radial distance as the solar wind flow slows down on approach to the heliopause. Eventually, the distance between the folds of the heliospheric neutral sheet becomes comparable to the gyro-radius of a galactic cosmic ray ion (0.1-0.2 AU for protons between 100 MeV and 1 GeV). When this happens, cosmic rays acquire a high degree of mobility across a stack of magnetic sectors. Particle transport is diffusive as a result of drift-like motion across sectors of variable width. Using particle orbit simulations we investigate the dependence of neutral sheet diffusion on the mean sector width, the magnitude and spatial scale of the sector width variability, and the energy of the particle. The mechanism could be responsible for record-high galactic cosmic ray fluxes measured by Voyager 1.

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