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Titre du document / Document title

Model calculations of the particle spectrum of the galactic cosmic ray (GCR) environment : Assessment with ACE/CRIS and MARIE measurements

Auteur(s) / Author(s)

SAGANTI Premkumar B. (1) ; CUCINOTTA Francis A. (2) ; WILSON John W. (3) ; CLEGHORN Timothy F. (2) ; ZEITLIN Cary J. (4) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) NASA Center for Applied Radiation Research, Prairie View A& M University, TX-77446, ETATS-UNIS
(2) NASA Johnson Space Center, Houston, TX-77058, ETATS-UNIS
(3) NASA Langley Research Center, Hampton, VA-23681, ETATS-UNIS
(4) Lawrence Berkeley National Laboratory, Berkeley, CA-94720, ETATS-UNIS

Résumé / Abstract

For a given galactic cosmic ray (GCR) environment, understanding the distribution of the particle flux (protons, alpha particles, and heavy ions) in deep-space and on the surface of planetary systems such as Mars are essential for the risk assessment of future human exploration missions. In our model calculations, we make use of the NASA's HZETRN (High Z and Energy Transport) code along with the nuclear fragmentation cross sections that are described by the quantum multiple scattering (QMSFRG) model with the time-dependant variation of the GCR eAvironment derived making use of the solar modulation potential, phi. Data from the cosmic ray isotope spectrometer (CRIS) instrument onboard the advanced composition explorer (ACE) has been available from 1998. Data from the CRIS instrument is being analyzed to understand the short term variations in the particle spectrum during the current solar cycle phase. In this report, particle spectrum for December 2002 of the CRIS instrument was compared with the model calculations. Current assessment of the model calculations show very good agreement of the particle flux (∼ 15% for low Z and ∼ 5% for high Z) data from Boron (Z = 5) through Nickel (Z = 28) nuclei for the energy bins reported by CRIS. Similarly, the model calculated dose-rate calculations are compared with the proton flux measured dose-rate from the Martian Radiation Environment Experiment (MARIE) currently onboard the 2001 Mars Odyssey spacecraft in Martian orbit for the month of August 2003 that is representative of a quiet-time GCR data at Mars. Current model calculations are well within 10% of the measured observations of MARIE. The predictive capabilities of the quiet-time GCR particle flux model calculations are promising for biological and shielding studies and for the radiation risk assessment for future human explorations.

Revue / Journal Title

Radiation measurements    ISSN  1350-4487 

Source / Source

2006, vol. 41, no 9-10 (203 p.)  [Document : 6 p.] (15 ref.), pp. 1152-1157 [6 page(s) (article)]

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Kidlington, ROYAUME-UNI  (1994) (Revue)

Mots-clés anglais / English Keywords

experimental studies

;

nickel

;

boron

;

solar cycles

;

instruments

;

isotopes

;

cross sections

;

fragmentation

;

transport

;

energy

;

NASA

;

risk assessment

;

Mars

;

ions

;

protons

;

cosmic rays

;

particles

;

models

;

Mots-clés français / French Keywords

CRIS

;

MARIE

;

Etude expérimentale

;

Nickel

;

Bore

;

Cycle solaire

;

Instrumentation

;

Isotope

;

Coupe transversale

;

Fragmentation

;

Transport

;

Energie

;

NASA

;

Analyse risque

;

Planète Mars

;

Ion

;

Proton

;

Rayonnement cosmique

;

Particule

;

Modèle

;

Mots-clés espagnols / Spanish Keywords

Niquel

;

Boro

;

Instrumentación

;

Isótopo

;

Fragmentación

;

Transporte

;

Energía

;

Planeta Marte

;

Ión

;

Protón

;

Modelo

;

Localisation / Location

INIST-CNRS, Cote INIST : 17536, 35400014316450.0130

Nº notice refdoc (ud4) : 18371562



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