Journal
ASTROPHYSICAL JOURNAL
Volume 765, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/765/2/91
Keywords
cosmic rays; solar wind; Sun: heliosphere
Categories
Funding
- Italian Space Agency (ASI)
- Deutsches Zentrum fur Luft- und Raumfahrt (DLR)
- Swedish National Space Board
- Swedish Research Council
- Russian Space Agency (Roscosmos)
- Russian Foundation for Basic Research
- South African National Research Council (NRF)
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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.
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