A time-dependent diffusion convection model for the long term modulation of cosmic rays

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Models, Cosmic Rays, Time Dependence, Convection, Diffusion, Hysteresis, Interplanetary Medium, Phase Modulation, Solar Cycles, Time Lag, Wave Propagation

Scientific paper

A model is developed which incorporates to first order the direct effects of the time dependent diffusive propagation of interstellar cosmic rays in a slowly changing interplanetary medium. The model provides a physical explanation for observed rigidity-dependent phase lags in modulated spectra (cosmic ray hysteresis). The average distance to the modulating boundary during the last solar cycle is estimated.

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