Artificial ion beam instabilities. I - Linear theory. II - Simulations

Details Artificial ion beam instabilities. I - Linear theory. II - Simulations Artificial ion beam instabilities. I - Linear theory. II - Simulations

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9510623s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, July 1, 1990, p. 10623-10641, 10643-10653.

Physics

13

Data Simulation, F Region, Ion Beams, Ion Injection, Ionospheric Ion Density, Magnetohydrodynamic Stability, Collisionless Plasmas, Gyrofrequency, Heavy Ions, Linear Transformations, Magnetospheric Instability, Oxygen Ions, Plasma Diffusion, Vlasov Equations

Scientific paper

Some of the important plasma instabilities that result when an artificial ion beam is injected into the ionospheric F region are studied using linear Vlasov theory. The variation in wave spectra at the receiver as the receiver and plasma gun separate perpendicularly to the magnetic field is consistent with a beam density decrease at or near the receiver. At separation distances that are large fractions of the beam gyrodiameter, usually narrow-band waves near the background lower hybrid and H+ gyroharmonic frequencies are measured. These observations are consistent with waves expected to be generated by beam densities on the order of or less than a few percent of the background density. At smaller separation distances, broadband waves are usually observed with frequencies from zero up to and above the lower hybrid frequency. Electrostatic particle simulation studies of the plasma instabilities indicate that the broadband fluidlike lower hybrid instability is the most important for background particle heating. Perpendicular H+ heating is more efficient than perpendicular O+ or parallel electron heating for the drift velocity regime most relevant to past experiments.

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