Other
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9714959s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A10, p. 14,959-14,965.
Other
6
Electric Potential, Ion Beams, Plasma Interactions, Space Plasmas, Spacecraft Charging, Electrostatic Charge, Indium, Magnetohydrodynamic Stability
Scientific paper
An ion-beam emitter is described and analyzed in terms of its effectiveness in the control of spacecraft potential during space missions for measuring cold plasmas. Specific attention is given to the effects the ion-beam emitter can have on the plasmas, and a linear-theory parameter search is undertaken to identify situations in which plasma instabilities can be excited. The plasma model is restricted to the area near the spacecraft in which an indium beam moves within an ion-electron plasma, and parameters are varied including plasma-sheet conditions, boundary layer, lobe, and solar wind. A hybrid instability is noted in the analysis which relates to wave propagation transverse to the ambient magnetic field, and the beam-emission current is analyzed with respect to the stability threshold. The emission current can be varied to excite and/or stop the instability so that other spacecraft effects can be gauged.
Ashour-Abdalla Maha
Schmidt Rudiger R.
Schriver David
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