Deciphering the local Interstellar spectra of primary cosmic ray species with HelMod - INSPIRE

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Deciphering the local Interstellar spectra of primary cosmic ray species with HelMod

M.J. Boschini
(
- INFN, Milan Bicocca and
- LASA, Segrate
)
,
S. Della Torre
(
- INFN, Milan Bicocca
)
,
M. Gervasi
(
- INFN, Milan Bicocca and
- Milan Bicocca U.
)
,
D. Grandi
(
- INFN, Milan Bicocca
)
,
G. Jóhannesson
(
- Iceland U. and
- Nordita
)

Apr 19, 2018

13 pages

Published in:

Astrophys.J. 858 (2018) 1, 61

Published: May 4, 2018

e-Print:

1804.06956 [astro-ph.HE]

DOI:

10.3847/1538-4357/aabc54

View in:

ADS Abstract Service

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Abstract: (IOP)

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 ∼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).

Note:

13 pages, 13 figures, 6 tables, ApJ in press. arXiv admin note: text overlap with arXiv:1704.06337

cosmic rays
diffusion
elementary particles
interplanetary medium
ISM: general
Sun: heliosphere
cosmic radiation: primary
cosmic radiation: spectrum
magnetic field: solar
energy: high

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