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

TL;DR

This paper presents a straightforward analytical model of the local interstellar spectrum to accurately fit cosmic-ray proton flux data from AMS and PAMELA detectors, enhancing understanding of cosmic-ray modulation.

Contribution

The paper introduces a simple power-law model for the local interstellar spectrum that effectively fits proton flux measurements from multiple space-based detectors.

Findings

The model accurately fits proton flux data from AMS and PAMELA.

A simple power-law LIS can describe cosmic-ray proton spectra.

The approach improves understanding of solar modulation effects.

Abstract

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 PAMELA detector in several campaigns covering the period 2006-2009. The CR proton spectrum at Earth is derived starting from the model of the local interstellar spectrum (LIS) and folding it with the solar modulation potential in the force field approximation. The data are well described by a LIS modeled with a simple power law particle momentum density.