Physics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.3631m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, April 1, 1989, p. 3631-3651. Research supported by NASA.
Physics
11
Auroral Zones, Electron Beams, Nonlinear Evolution Equations, Space Plasmas, Whistlers, Electron Distribution, Ionospheric Electron Density, Kinetic Equations, Vertical Distribution
Scientific paper
The nonlinear spatial evolution, from the source to the atmosphere, of the auroral electron beam and the beam-generated electrostatic whistler noise was studied, calculating changes in beam parameters from equations for the conservation of total particle and wave energy and momentum flux density. Wave power fluxes were calculated by numerically integrating the wave kinetic equations, and the levels of beam-generated noise were determined by using thermal levels of Cerenkov radiation as a source. It was found that beam parameters evolve on ionospheric scale lengths, and their positive slope feature in velocity space is maintained over altitudes measured in thousands of kilometers of altitude, even though they can generate wave energy density fluxes sufficient to modify the ionospheric density profile.
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