1887

Abstract

The numerical solution of diffusion equation for geomagnetically trapped protons taking into account<br>deceleration of protons by Coulomb interactions with free and bounded electrons, the charge exchange<br>process, the cosmic ray albedo neutron decay (CRAND) source and electric and magnetic radial diffusion was<br>obtained using the PELLPACK code based on the finite element method. The advantage of the method in<br>comparison with the traditional finite differences method is a several order greater speed of computation at the<br>same precision. When boundary conditions at L=7 are given with the distribution function extracted from<br>proton spectrum obtained on board of ATS 6 satellite, the PELLPACK code produces 2D unidirectional proton<br>flux at the top of geomagnetic lines from L=1 up to L=7 that satisfactory agrees with the AP8 model proton flux<br>for all proton energies more than ~ 300 - 500 keV. For less proton energies AP8 model predicts the trapped<br>proton fluxes on several orders of magnitude greater than PELLPACK code at L < 4 that possibly could be<br>explained by uncertainty of very low energy proton flux data at L=7. The detailed fitness of observational model<br>proton fluxes by numerical theoretical solution of transport equation is still not attained.

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/content/papers/10.3997/2214-4609-pdb.215.sbgf030
1999-08-15
2024-03-29
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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609-pdb.215.sbgf030
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