Abstract
Phenomenological models are examined which are used to interpret the available experimental data on the spectra, composition, and anisotropy of galactic cosmic rays with energies of less than 3 million GeV. The following types of models are reviewed: closed, leaky box, nested leaky box, diffusion, dynamical halo, very inhomogeneous, continuous acceleration, and extragalactic. Consideration is given to the physical mechanisms that govern cosmic-ray confinement and escape and to the interpretation of cosmic-ray observations at earth in terms of the above models. Observations of the diffuse gamma-ray emission of the galaxy are discussed which appear to rule out the extragalactic model. The problem of very high-energy cosmic rays (higher than 3 million GeV) is briefly noted.
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