Electron beam injection during active experiments. I - Electromagnetic wave emissions

Details Electron beam injection during active experiments. I - Electromagnetic wave emissions Electron beam injection during active experiments. I - Electromagnetic wave emissions

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.6167w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 6167-6190.

Computer Science

Sound

25

Beam Injection, Cyclotron Radiation, Electron Beams, Plasma-Particle Interactions, Spaceborne Experiments, Cyclotron Frequency, Electron Plasma, Plasma Frequencies, Sounding Rockets, Very Low Frequencies, Wave Propagation

Scientific paper

The wave emissions produced in Echo 7 experiment by active injections of electron beams were investigated to determine the properties of the electromagnetic and electrostatic fields for both the field-aligned and cross-field injection in such experiments and to evaluate the sources of free energy and relative efficiencies for the generation of the VLF and HF emissions. It is shown that, for typical beam energies in active experiments, electromagnetic effects do not substantially change the bulk properties of the beam, spacecraft charging, and plasma particle acceleration. Through simulations, beam-generated whistlers; fundamental z-mode and harmonic x-mode radiation; and electrostatic electron-cyclotron, upper-hybrid, Langmuir, and lower-hybrid waves were identified. The characteristics of the observed wave spectra were found to be sensitive to both the ratio of the electron plasma frequency to the cyclotron frequency and the angle of injection relative to the magnetic field.

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