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Proton Fluxes Measured by the PAMELA Experiment from the Minimum to the Maximum Solar Activity for Solar Cycle 24
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2018 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 854, no 1, article id L2Article in journal (Refereed) Published
Abstract [en]

Precise measurements of the time-dependent intensity of the low-energy (<50 GeV) galactic cosmic rays (GCRs) are fundamental to test and improve the models that describe their propagation inside the heliosphere. In particular, data spanning different solar activity periods, i.e., from minimum to maximum, are needed to achieve comprehensive understanding of such physical phenomena. The minimum phase between solar cycles 23 and 24 was peculiarly long, extending up to the beginning of 2010 and followed by the maximum phase, reached during early 2014. In this Letter, we present proton differential spectra measured from 2010 January to 2014 February by the PAMELA experiment. For the first time the GCR proton intensity was studied over a wide energy range (0.08-50 GeV) by a single apparatus from a minimum to a maximum period of solar activity. The large statistics allowed the time variation to be investigated on a nearly monthly basis. Data were compared and interpreted in the context of a state-of-the-art three-dimensional model describing the GCRs propagation through the heliosphere.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2018. Vol. 854, no 1, article id L2
Keywords [en]
astroparticle physics, cosmic rays, Sun: heliosphere
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-223499DOI: 10.3847/2041-8213/aaa9b2ISI: 000424238600002Scopus ID: 2-s2.0-85042130192OAI: oai:DiVA.org:kth-223499DiVA, id: diva2:1185237
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QC 20180223

Available from: 2018-02-23 Created: 2018-02-23 Last updated: 2018-02-23Bibliographically approved

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Carlson, PerPearce, Mark

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