Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsh54a..03s&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SH54A-03
Other
2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2774 Radiation Belts, 7959 Models, 7984 Space Radiation Environment
Scientific paper
The main source of antiprotons for Earth's radiation belt is decay of albedo antineutrons formed by interactions of cosmic rays with the atmosphere. This is analogous to the CRAND (cosmic ray albedo neutron decay) process that is the main source of high-energy (>100~MeV) radiation belt protons. We describe the intensity and spatial distribution of both the antiproton and proton components based on numerical simulation of the inner radiation belt. The albedo process is modeled using Geant4, a Monte Carlo nuclear transport code. Other model inputs to the simulation include the galactic cosmic ray intensity, atmospheric densities, the geomagnetic field, the radial (cross-L) diffusion coefficient, cross sections for trapped particle losses due to inelastic nuclear processes including annihilation, and rates of energy loss to ionization of the atmosphere. The resulting antiproton intensity is compared to that from other sources.
Labrador Allan Wayne
Looper Mark Dixon
Mewaldt Richard A.
Selesnick Richard S.
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