TIME DEPENDENCE OF THE PROTON FLUX MEASURED BY PAMELA DURING THE 2006 JULY-2009 DECEMBER SOLAR MINIMUM
- Department of Physics, University of Florence, I-50019 Sesto Fiorentino, Florence (Italy)
- Department of Physics, University of Naples ''Federico II'', I-80126 Naples (Italy)
- Lebedev Physical Institute, RU-119991 Moscow (Russian Federation)
- Department of Physics, University of Bari, I-70126 Bari (Italy)
- INFN, Sezione di Trieste, I-34149 Trieste (Italy)
- Ioffe Physical Technical Institute, RU-194021 St. Petersburg (Russian Federation)
- INFN, Sezione di Rome ''Tor Vergata'', I-00133 Rome (Italy)
- INFN, Sezione di Florence, I-50019 Sesto Fiorentino, Florence (Italy)
- INFN, Sezione di Bari, I-70126 Bari (Italy)
- INFN, Sezione di Naples, I-80126 Naples (Italy)
- KTH, Department of Physics, and the Oskar Klein Centre for Cosmoparticle Physics, AlbaNova University Centre, SE-10691 Stockholm (Sweden)
- Department of Physics, University of Rome ''Tor Vergata'', I-00133 Rome (Italy)
- IFAC, I-50019 Sesto Fiorentino, Florence (Italy)
The energy spectra of galactic cosmic rays carry fundamental information regarding their origin and propagation. These spectra, when measured near Earth, are significantly affected by the solar magnetic field. A comprehensive description of the cosmic radiation must therefore include the transport and modulation of cosmic rays inside the heliosphere. During the end of the last decade, the Sun underwent a peculiarly long quiet phase well suited to study modulation processes. In this paper we present proton spectra measured from 2006 July to 2009 December by PAMELA. The large collected statistics of protons allowed the time variation to be followed on a nearly monthly basis down to 400 MV. Data are compared with a state-of-the-art three-dimensional model of solar modulation.
- OSTI ID:
- 22127022
- Journal Information:
- Astrophysical Journal, Vol. 765, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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