The effect of injection location on the spectrum of energetic magnetospheric particles

Physics

Scientific paper

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Earth Magnetosphere, Energetic Particles, Incident Radiation, Magnetically Trapped Particles, Particle Energy, Atmospheric Models, Jupiter Atmosphere, Particle Accelerators, Steady State

Scientific paper

The role of local particle injections and accelerations in determining energetic particle spectra used as an indication of the radial diffusion of trapped magnetospheric particles is assessed. An idealized one-dimensional steady-state model of magnetospheric radial transport in which diffusion is balanced against particle sources and sinks is used to illustrate the effects of particle injection at a point and over a band of radii in which the observation point is immersed in particle spectra. For an injection spectrum uniformly distributed in space and a step function in energy, it is shown that the energy dependence of the measured spectrum is determined not only by adiabatic energization of the input spectrum but by the spatial structure of the injection and the radial dependence of the diffusion coefficient as well. The relevance of the results for observations of particle spectra in the terrestrial and Jovian magnetospheres is also considered

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