Quasi-linear pitch angle diffusion coefficients: Retaining high harmonics

Details Quasi-linear pitch angle diffusion coefficients: Retaining high harmonics Quasi-linear pitch angle diffusion coefficients: Retaining high harmonics

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9923741a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A12, p. 23,741-23,745

Physics

40

Cyclotron Frequency, Diffusion Coefficient, Electron Distribution, Electron Scattering, Harmonic Radiation, Latitude, Particle Precipitation, Plasmasphere, Wave Propagation, Earth Magnetosphere, Geomagnetism, Plasmas (Physics), Steady State

Scientific paper

Diffusion coefficents for electrons pitch angle scattered by plasmaspheric hiss are reconsidered, as given by quasi-linear theroy, overcoming pratical problems in keeping high cyclotron harmonics n. Upper bounds are used to identify ranges of latitude, n, and wave-normal angle which give only negligible contributions, so that the detailed computation of these values may be avoided, resulting in large savings of computational effort. A simple wasy of obtaining precipitation lifetimes from the diffusion coefficents is also given, using a shooting method. The lifetimes and steady state fluxes are computed, leading to shorter lifetimes and lower fluxes than previously reported, for energies above 500 keV and McIlwain parameter L greater than 3.

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