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Back-Tracing and Flux Reconstruction for Solar Events with PAMELA

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arxiv 1412.1765 v5 pith:2WDSP2Y5 submitted 2014-12-04 astro-ph.IM astro-ph.HEphysics.space-ph

Back-Tracing and Flux Reconstruction for Solar Events with PAMELA

classification astro-ph.IM astro-ph.HEphysics.space-ph
keywords pamelaeventsfluxparticlereconstructionsolaraccurateanalysis
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The PAMELA satellite-borne experiment is providing first direct measurements of Solar Energetic Particles (SEPs) with energies from $\sim$80 MeV to several GeV in near-Earth space. Its unique observational capabilities include the possibility of measuring the flux angular distribution and thus investigating possible anisotropies related to SEP events. This paper focuses on the analysis methods developed to estimate SEP energy spectra as a function of the particle pitch angle with respect to the Interplanetary Magnetic Field (IMF). The crucial ingredient is provided by an accurate simulation of the asymptotic exposition of the PAMELA apparatus, based on a realistic reconstruction of particle trajectories in the Earth's magnetosphere. As case study, the results of the calculation for the May 17, 2012 event are reported.

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