Physics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9613781p&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Aug. 1, 1991, p. 13,781-13,793.
Physics
15
Beam Injection, Electron Beams, Ionospheric Electron Density, Plasma Density, Plasma-Particle Interactions, Charge Injection Devices, Ionospheric Propagation, Poisson Equation, Three Dimensional Models
Scientific paper
To study the injection of an electron beam into the ionosphere from an isolated source, a 3D numerical simulation is set forth based on electrostatic particles. Experimental values are used for the beam velocity (based on beam energy and injection current), and the cases of injections into a vacuum, into a parallel ambient plasmas, and into ambient magnetic fields. Stagnation time (Ts) is found to depend on beam energy. The capacitance of the isolated source is determined by using the charge accumulation and the time dependence of the isolated source's potential. A series of trapping vortices are produced in phase space from injections parallel to the magnetic field. Injections at 45 degrees to the magnetic field result in a hollow cylindrical beam, in which the wave spectrum is dominated by a peak slightly under the upper hybrid frequency, and intense low-frequency modes are found outside the cylinder.
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