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Title: Solution of Heliospheric Propagation: Unveiling the Local Interstellar Spectra of Cosmic-ray Species

Abstract

Local interstellar spectra (LIS) for protons, helium, and antiprotons are built using the most recent experimental results combined with state-of-the-art models for propagation in the Galaxy and heliosphere. Two propagation packages, GALPROP and HelMod, are combined to provide a single framework that is run to reproduce direct measurements of cosmic-ray (CR) species at different modulation levels and at both polarities of the solar magnetic field. To do so in a self-consistent way, an iterative procedure was developed, where the GALPROP LIS output is fed into HelMod, providing modulated spectra for specific time periods of selected experiments to compare with the data; the HelMod parameter optimization is performed at this stage and looped back to adjust the LIS using the new GALPROP run. The parameters were tuned with the maximum likelihood procedure using an extensive data set of proton spectra from 1997 to 2015. The proposed LIS accommodate both the low-energy interstellar CR spectra measured by Voyager 1 and the high-energy observations by BESS, Pamela, AMS-01, and AMS-02 made from the balloons and near-Earth payloads; it also accounts for Ulysses counting rate features measured out of the ecliptic plane. The found solution is in a good agreement with proton, helium, andmore » antiproton data by AMS-02, BESS, and PAMELA in the whole energy range.« less

Authors:
; ; ; ; ; ; ; ;  [1];  [2];  [3]; ;  [4]; ; ;  [5];  [6]
  1. INFN, Milano-Bicocca, Milano (Italy)
  2. Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavik (Iceland)
  3. Institutt for fysikk, NTNU, NO-7491 Trondheim (Norway)
  4. INFN, Bologna (Italy)
  5. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305 (United States)
  6. Frankfurt Institute of Advanced Studies, Frankfurt (Germany)
Publication Date:
OSTI Identifier:
22663607
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 840; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANTIPROTONS; COMPARATIVE EVALUATIONS; COSMIC RADIATION; COUNTING RATES; DIFFUSION; GALAXIES; HELIOSPHERE; HELIUM; INTERSTELLAR SPACE; ITERATIVE METHODS; MAGNETIC FIELDS; PROTON SPECTRA; SUN; VOYAGER SPACE PROBES

Citation Formats

Boschini, M. J., Torre, S. Della, Gervasi, M., Grandi, D., Vacca, G. La, Pensotti, S., Rancoita, P. G., Rozza, D., Tacconi, M., Jóhannesson, G., Kachelriess, M., Masi, N., Quadrani, L., Moskalenko, I. V., Orlando, E., Porter, T. A., and Ostapchenko, S. S. Solution of Heliospheric Propagation: Unveiling the Local Interstellar Spectra of Cosmic-ray Species. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA6E4F.
Boschini, M. J., Torre, S. Della, Gervasi, M., Grandi, D., Vacca, G. La, Pensotti, S., Rancoita, P. G., Rozza, D., Tacconi, M., Jóhannesson, G., Kachelriess, M., Masi, N., Quadrani, L., Moskalenko, I. V., Orlando, E., Porter, T. A., & Ostapchenko, S. S. Solution of Heliospheric Propagation: Unveiling the Local Interstellar Spectra of Cosmic-ray Species. United States. doi:10.3847/1538-4357/AA6E4F.
Boschini, M. J., Torre, S. Della, Gervasi, M., Grandi, D., Vacca, G. La, Pensotti, S., Rancoita, P. G., Rozza, D., Tacconi, M., Jóhannesson, G., Kachelriess, M., Masi, N., Quadrani, L., Moskalenko, I. V., Orlando, E., Porter, T. A., and Ostapchenko, S. S. Wed . "Solution of Heliospheric Propagation: Unveiling the Local Interstellar Spectra of Cosmic-ray Species". United States. doi:10.3847/1538-4357/AA6E4F.
@article{osti_22663607,
title = {Solution of Heliospheric Propagation: Unveiling the Local Interstellar Spectra of Cosmic-ray Species},
author = {Boschini, M. J. and Torre, S. Della and Gervasi, M. and Grandi, D. and Vacca, G. La and Pensotti, S. and Rancoita, P. G. and Rozza, D. and Tacconi, M. and Jóhannesson, G. and Kachelriess, M. and Masi, N. and Quadrani, L. and Moskalenko, I. V. and Orlando, E. and Porter, T. A. and Ostapchenko, S. S.},
abstractNote = {Local interstellar spectra (LIS) for protons, helium, and antiprotons are built using the most recent experimental results combined with state-of-the-art models for propagation in the Galaxy and heliosphere. Two propagation packages, GALPROP and HelMod, are combined to provide a single framework that is run to reproduce direct measurements of cosmic-ray (CR) species at different modulation levels and at both polarities of the solar magnetic field. To do so in a self-consistent way, an iterative procedure was developed, where the GALPROP LIS output is fed into HelMod, providing modulated spectra for specific time periods of selected experiments to compare with the data; the HelMod parameter optimization is performed at this stage and looped back to adjust the LIS using the new GALPROP run. The parameters were tuned with the maximum likelihood procedure using an extensive data set of proton spectra from 1997 to 2015. The proposed LIS accommodate both the low-energy interstellar CR spectra measured by Voyager 1 and the high-energy observations by BESS, Pamela, AMS-01, and AMS-02 made from the balloons and near-Earth payloads; it also accounts for Ulysses counting rate features measured out of the ecliptic plane. The found solution is in a good agreement with proton, helium, and antiproton data by AMS-02, BESS, and PAMELA in the whole energy range.},
doi = {10.3847/1538-4357/AA6E4F},
journal = {Astrophysical Journal},
number = 2,
volume = 840,
place = {United States},
year = {Wed May 10 00:00:00 EDT 2017},
month = {Wed May 10 00:00:00 EDT 2017}
}