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Deciphering the Local Interstellar Spectra of Primary Cosmic-Ray Species with HELMOD
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Number of Authors: 142018 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 858, no 1, article id 61Article in journal (Refereed) Published
Abstract [en]

Local interstellar spectra (LIS) of primary cosmic ray (CR) nuclei, such as helium, oxygen, and mostly primary carbon are derived for the rigidity range from 10 MV to similar to 200 TV using the most recent experimental results combined with the state-of-the-art models for CR propagation in the Galaxy and in the heliosphere. Two propagation packages, GALPROP and HELMOD, are combined into a single framework that is used to reproduce direct measurements of CR species at different modulation levels, and at both polarities of the solar magnetic field. The developed iterative maximum-likelihood method uses GALPROP-predicted LIS as input to HELMOD, which provides the modulated spectra for specific time periods of the selected experiments for model-data comparison. The interstellar and heliospheric propagation parameters derived in this study are consistent with our prior analyses using the same methodology for propagation of CR protons, helium, antiprotons, and electrons. The resulting LIS accommodate a variety of measurements made in the local interstellar space (Voyager 1) and deep inside the heliosphere at low (ACE/CRIS, HEAO-3) and high energies (PAMELA, AMS-02).

Place, publisher, year, edition, pages
2018. Vol. 858, no 1, article id 61
Keywords [en]
cosmic rays - diffusion - elementary particles - interplanetary medium - ISM, general - Sun, heliosphere
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-156614DOI: 10.3847/1538-4357/aabc54ISI: 000431477400012OAI: oai:DiVA.org:su-156614DiVA, id: diva2:1210371
Available from: 2018-05-28 Created: 2018-05-28 Last updated: 2018-05-28Bibliographically approved

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Jóhannesson, Guðlaugur
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Nordic Institute for Theoretical Physics (Nordita)
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