Electron beam injection during active experiments. II - Collisional effects

Details Electron beam injection during active experiments. II - Collisional effects Electron beam injection during active experiments. II - Collisional effects

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.6191w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 6191-6207.

Physics

13

Aeronomy, Beam Injection, Electron Beams, Gas Ionization, Spacecraft Charging, Electric Fields, Electric Potential, Electromagnetic Fields, Electron Bombardment, Low Altitude, Neutral Particles, Rocket Firing, Spacelab, Upper Atmosphere

Scientific paper

During active beam experiments, the presence of high neutral densities at low altitudes and/or during thruster firings has been observed to modify the spacecraft charging and the properties of the beam. Two-dimensional (three-velocity) electromagnetic particle simulations with ionizing collisions incorporated are used to investigate the modification of the beam-plasma interaction as the neutral density is increased. It is shown that when the spacecraft is uniformly immersed in a neutral cloud, most of the ionization is produced by direct ionization by the beam and its secondaries, rather than via vehicle-induced or wave-induced ionization for the neutral densities considered.

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