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Precise time-dependent measurements of the Z = 2 component in the cosmicradiation provide crucial information about the propagation of chargedparticles through the heliosphere. The PAMELA experiment, with its long flightduration (15th June 2006 - 23rd January 2016) and the low energy threshold (80MeV/n) is an ideal detector for cosmic ray solar modulation studies. In thispaper, the helium nuclei spectra measured by the PAMELA instrument from July2006 to December 2009 over a Carrington rotation time basis are presented. Astate-of-the-art three-dimensional model for cosmic-ray propagation inside theheliosphere was used to interpret the time-dependent measured fluxes.Proton-to-helium flux ratio time profiles at various rigidities are alsopresented in order to study any features which could result from the differentmasses and local interstellar spectra shapes.

Time dependence of the flux of helium nuclei in cosmic rays measured by the PAMELA experiment between July 2006 and December 2009