Time dependence of the helium flux measured by PAMELA

N. Marcelli,O. Adriani,G. C. Barbarino, G. A. Bazilevskaya,R. Bellotti,M. Boezio,E. A. Bogomolov,M. Bongi,V Bonvicini,S. Bottai,A. Bruno,F. Cafagna,D. Campana, P. Carlson,M. Casolino, G. Castellini,C. De Santis,V Di Felice,A. M. Galper, V Karelin A., V Koldashov S.,S. Koldobskiy,S. Y. Krutkov,A. N. Kvashnin,A. Leonov, V Malakhov, L. Marcelli,M. Martucci,A. G. Mayorov, W. Menn, M. Merge, V. V. Mikhailov,E. Mocchiutti,A. Monaco, N. Mori,R. Munini,G. Osteria, B. Panico, P. Papini,M. Pearce, P. Picozza,M. Ricci,S. B. Ricciarini,M. Simon,R. Sparvoli, P. Spillantini,I Stozhkov Y.,A. Vacchi, E. Vannuccini,G. Vasilyev,S. A. Voronov,Y. T. Yurkin,G. Zampa,N. Zampa,M. S. Potgieter,O. P. M. Aslam,D. Bisschoff

EPJ Web of Conferences（2019）

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摘要

Precision measurements of the Z = 2 component in cosmic radiation provide crucial information about the origin and propagation of the second most abundant cosmic ray species in the Galaxy (9% of the total). These measurements, acquired with the PAMELA space experiment orbiting Earth, allow to study solar modulation in details. Helium modulation is compared to the modulation of protons to study possible dependencies on charge and mass. The time dependence of helium fluxes on a monthly basis measured by PAMELA has been studied for the period between July 2006 to January 2016 in the energy range from 800 MeV/n to similar to 20 GeV/n.

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