Physics
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993angeo..11..697k&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 11, no. 8, p. 697-704.
Physics
26
Geomagnetism, Hydrogen Atoms, Magnetic Dipoles, Particle Motion, Proton Energy, Proton Flux Density, Magnetic Effects, Transport Properties
Scientific paper
Transport of proton-H atom fluxes in a nitrogen atmosphere has been simulated by the Monte Carlo method and 'collision-by-collision' algorithm. The model, which includes a dipolar magnetic field, was compared to one without a field. The influence of the dipole magnetic field on the energy deposition function, albedo, radial beam spreading and charge-state fractions was investigated for beams with an isotropic initial angle distribution and for monodirectional beams; the initial proton energy was in the range 1-100 keV. Two mechanisms of field influence were considered: (i) the adiabatic relation for protons, and (ii) the convergence of the magnetic field lines for H-atoms. It was found that both mechanisms are important in calculating the albedo and the charge fractions in the albedo fluxes. It is shown that the radius of the p-H beam depends strongly on the altitude of the maximum energy deposition.
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