scholarly journals Monte Carlo analysis of pion contribution to absorbed dose from Galactic cosmic rays

2009 ◽  
Vol 267 (7) ◽  
pp. 1115-1124 ◽  
Author(s):  
S.K. Aghara ◽  
S.R. Blattnig ◽  
J.W. Norbury ◽  
R.C. Singleterry
Keyword(s):  
Monte Carlo ◽  
Cosmic Rays ◽  
Absorbed Dose ◽  
Monte Carlo Analysis ◽  
Galactic Cosmic Rays ◽  
Pion Contribution

Gamma-rays from cosmic-ray irradiated molecular clouds

1981 ◽  
Vol 301 (1462) ◽  
pp. 533-535 ◽  
Keyword(s):  
Monte Carlo ◽  
Cosmic Rays ◽  
Gamma Rays ◽  
Molecular Clouds ◽  
Cosmic Ray ◽  
Monte Carlo Analysis ◽  
The Galaxy

An examination is made of the contribution to the number of apparently discrete sources of y-rays from cosmic rays interacting with molecular clouds in the Galaxy. Attention is directed to specific nearby clouds and to clouds in general, the latter by a Monte-Carlo analysis.

Absorbed dose from galactic cosmic rays and solar protons as derived from stratospheric measurements

2007 ◽  
Vol 71 (7) ◽  
pp. 1058-1060
Author(s):  
N. S. Svirzhevsky ◽  
G. A. Bazilevskaya ◽  
A. K. Svirzhevskaya ◽  
Yu. I. Stozhkov
Keyword(s):  
Cosmic Rays ◽  
Absorbed Dose ◽  
Galactic Cosmic Rays

Atmospheric phenomena affecting the methane lifetime on Mars

2021 ◽  
Author(s):  
John Lee Grenfell ◽  
Fabian Wunderlich ◽  
Miriam Sinnhuber ◽  
Konstantin Herbst ◽  
Markus Scheucher ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Cosmic Rays ◽  
Seasonal Changes ◽  
Galactic Cosmic Rays ◽  
Solar Cosmic Rays ◽  
Secondary Importance ◽  
Air Shower ◽  
Mixing Coefficients ◽  
Atmospheric Phenomena ◽  
Chemical Rate

<p>We investigate a range of atmospheric phenomena concerning their potential to address the Martian methane lifetime discrepancy. This refers to the over-estimate of the modelled lifetimes compared to observations by a factor of up to six hundred. We apply a newly developed atmospheric photochemical model where we vary in a Monte Carlo approach the chemical rate and Eddy mixing coefficients within their current uncertainties. We also investigate the effect of air shower events due to galactic cosmic rays and solar cosmic rays. Our results suggest that the current uncertainty in chemical rates and transport together with seasonal changes in the water column can likely account for up to a factor of about thirty in the Mars methane lifetime discrepancy whereas the air shower effects are likely to be of secondary importance.</p>

scholarly journals MODELS OF DIFFUSION OF GALACTIC COSMIC RAYS FROM SUPERBUBBLES

2007 ◽  
Vol 22 (05) ◽  
pp. 995-1026 ◽  
Author(s):  
LORENZO ZANINETTI
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Diffusion Coefficient ◽  
Cosmic Rays ◽  
Supernova Remnants ◽  
Galactic Plane ◽  
Target Material ◽  
Galactic Cosmic Rays ◽  
Variable Diffusion Coefficient ◽  
Variable Diffusion

Superbubbles are shells in the interstellar medium produced by the simultaneous explosions of many supernova remnants. The solutions of the mathematical diffusion and of the Fourier expansion in 1D, 2D and 3D were deduced in order to describe the diffusion of nucleons from such structures. The mean number of visits in the the case of the Levy flights in 1D was computed with a Monte Carlo simulation. The diffusion of cosmic rays has its physical explanation in the relativistic Larmor gyro-radius which is energy dependent. The mathematical solution of the diffusion equation in 1D with variable diffusion coefficient was computed. Variable diffusion coefficient means magnetic field variable with the altitude from the Galactic plane. The analytical solutions allow us to calibrate the code that describes the Monte Carlo diffusion. The maximum energy that can be extracted from the superbubbles is deduced. The concentration of cosmic rays is a function of the distance from the nearest superbubble and the selected energy. The interaction of the cosmic rays on the target material allows us to trace the theoretical map of the diffuse Galactic continuum gamma-rays. The streaming of the cosmic rays from the Gould Belts that contains the sun at its internal was described by a Monte Carlo simulation. Ten new formulas are derived.

Absorbed dose of secondary neutrons from galactic cosmic rays inside the international space station

2004 ◽  
Vol 34 (6) ◽  
pp. 1429-1432 ◽  
Author(s):  
I. Getselev ◽  
S. Rumin ◽  
N. Sobolevsky ◽  
M. Ufimtsev ◽  
M. Podzolko
Keyword(s):  
Cosmic Rays ◽  
International Space Station ◽  
Space Station ◽  
Absorbed Dose ◽  
Galactic Cosmic Rays ◽  
International Space ◽  
Secondary Neutrons
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