J/ApJ/840/115 Local interstellar spectra of cosmic-ray species (Boschini+, 2017)
Solution of heliospheric propagation: unveiling the local interstellar spectra
of cosmic-ray species.
Boschini M.J., Torre S.D., Gervasi M., Grandi D., Johannesson G.,
Kachelriess M., La Vacca G., Masi N., Moskalenko I.V., Orlando E.,
Ostapchenko S.S., Pensotti S., Porter T.A., Quadrani L., Rancoita P.G.,
Rozza D., Tacconi M.
<Astrophys. J., 840, 115 (2017)>
=2017ApJ...840..115B 2017ApJ...840..115B
ADC_Keywords: Models ; Interstellar medium
Keywords: cosmic rays; diffusion; elementary particles; interplanetary medium;
ISM: general; Sun: heliosphere
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, and
antiproton data by AMS-02, BESS, and PAMELA in the whole energy range.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 19 274 Proton local interstellar spectra
table7.dat 19 274 Helium local interstellar spectra
table8.dat 19 274 Antiproton local interstellar spectra
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See also:
J/A+A/534/A54 : GALPROP programme (Strong+, 2011)
J/ApJ/831/18 : H to Ni intensities in LISM from Voyager 1 (Cummings+, 2016)
http://galprop.stanford.edu/ : GALPROP home page
http://www.helmod.org/ : HelMod home page
Byte-by-byte Description of file: table[678].dat
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Bytes Format Units Label Explanations
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1- 9 E9.3 GV Ri [0.04/210200] Rigidity
11- 19 E9.3 m-2/s/sr/GV Int [4e-26/6512] Differential intensity
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 13-Dec-2017