Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh53c..03s&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH53C-03
Astronomy and Astrophysics
Astrophysics
[2199] Interplanetary Physics / General Or Miscellaneous, [6299] Planetary Sciences: Solar System Objects / General Or Miscellaneous, [7599] Solar Physics, Astrophysics, And Astronomy / General Or Miscellaneous, [7999] Space Weather / General Or Miscellaneous
Scientific paper
HZETRN 2010 is the most recent update to a series of space radiation transport codes developed at NASA Langley Research Center. Since the last official release (HZETRN 2005), several modifications, improvements, and corrections have been made to the numerical methods, transport methodologies, and nuclear physics models. In this talk, we first review the improved numerical methods and their impact on discretization error and run-time. Results from a comprehensive convergence study are given to show that the new methods are more accurate and nearly 100 times faster than their predecessors. Next, the low energy neutron transport model that includes back scattering and light ion target fragmentation is discussed. Results from a benchmark study using MCNPX, FLUKA, and HETC-HEDS are given to show that HZETRN 2010 agrees with the Monte Carlo codes for neutron flux, proton flux, dose, and dose equivalent to the extent that they agree with each other. The updated heavy ion nuclear fragmentation model, NUCFRG3 is also discussed. NUCFRG3 includes a parameterization for the even-odd effect observed in experimental data, a coalescence model for light ion formation, and an improved electromagnetic dissociation model. Finally, the improved speed and accuracy of HZETRN 2010 is demonstrated through a detailed validation study. In this study, HZETRN 2010 is compared to 77,000 measurements taken aboard the International Space Station over a six day period in 2001. The comparisons are used to characterize errors as a function of cutoff rigidity, allowing smooth extrapolation of Low Earth Orbit uncertainties to free space. A user friendly web-interface utilizing the HZETRN 2010 code base, called OLTARIS, is briefly summarized as well.
Adamczyk Anne M.
Badavi Francis F.
Blattnig Steve R.
Norbury John W.
Norman Ryan B.
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