Time dependence of the proton and helium fluxes measured by PAMELA during solar minimum (2006-2009)

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作者
Marcelli, Nadir [1 ,2 ]
Boezio, M. [3 ,4 ]
Lenni, A. [3 ,4 ,5 ]
Martucci, M. [1 ]
Menn, W. [6 ]
Munini, R. [3 ,4 ]
Sparvoli, R. [1 ,2 ]
Aslam, O. P. M. [7 ]
Bisschoff, D. [7 ]
Potgieter, M. S. [7 ]
机构
[1] INFN, Sez Roma Tor Vergata, I-00133 Rome, Italy
[2] Univ Roma Tor Vergata, Rome, Italy
[3] INFN, Sez Trieste, I-34149 Trieste, Italy
[4] IFPU, Trieste, Italy
[5] Univ Trieste, Trieste, Italy
[6] Univ Siegen, Dept Phys, D-57068 Siegen, Germany
[7] North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa
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P1 [天文学];
学科分类号
0704 ;
摘要
Precision measurements of the Z = 2 component in the cosmic radiation provide crucial information about both the origin and propagation of the helium nuclei in cosmic rays inside the Galaxy. Moreover, the precise measurement of the time-dependent helium nuclei fluxes allows an in-depth study of the solar modulation of such nuclei. These results can be compared with the widely studied modulation of protons, to possibly spot dependencies on particle's charge, mass or local interstellar spectra shape. The helium differential fluxes together with comparison between helium and proton energy spectra, measured by the PAMELA experiment down to 80 MeV, has been studied in the unusually long minimum of solar cycle 23 (July 2006 December 2009) over a 1-month time basis.
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页数:7
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    University of Rome Tor Vergata, Department of Physics, Rome
    I-00133, Italy
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    I-00133, Italy
    不详
    I-34149, Italy
    不详
    I-34014, Italy
    不详
    I-34100, Italy
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    D-57068, Germany
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    2520, South Africa
    不详
    24118, Germany
    不详
    I-50019, Italy
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    I-50019, Italy
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    I-80126, Italy
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    I-80126, Italy
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    RU-119991, Russia
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