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In this paper we discuss some simple analytical models to fit the cosmic-ray(CR) proton data collected by the AMS detector in June 1998 and by the PAMELAdetector in several campaigns covering the period 2006-2009. The CR protonspectrum at Earth is derived starting from the model of the local interstellarspectrum (LIS) and folding it with the solar modulation potential in the forcefield approximation. The data are well described by a LIS modeled with a simplepower law particle momentum density.

A simple Local Interstellar Spectrum model to fit the proton fluxes measured by the AMS and PAMELA detectors