A new approach to pitch angle scattering in the magnetosphere

Details A new approach to pitch angle scattering in the magnetosphere A new approach to pitch angle scattering in the magnetosphere

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88..201r&link_type=abstract

Journal of Geophysical Research, vol. 88, Jan. 1, 1983, p. 201-210. USAF-sponsored research.

Physics

12

Distribution Functions, Earth Magnetosphere, Electron Scattering, Particle Precipitation, Pitch (Inclination), Spatial Distribution, Boundary Conditions, Boundary Layer Equations, Diffusion Coefficient, Flux (Rate), Geomagnetism, Isis-B

Scientific paper

It is shown how the effects of a loss or source boundary condition at the atmospheric footpoints of a field line are smoothed by pitch angle diffusion along the field line. Starting from a quasilinear kinetic equation describing the effect of scattering, the bounce-averaged and the boundary layer equations are derived. The boundary layer equation is then solved to obtain the pitch angle distribution as a function of position along the field line. As an application, the distribution near the end of a field line is compared with ISIS particle data, giving a diagnostic measure of the strength of the scattering process and its dependence on invariant latitude and on particle energy.

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