Barium swarm - An ionospheric alternating current generator in CRIT I

Details Barium swarm - An ionospheric alternating current generator in CRIT I Barium swarm - An ionospheric alternating current generator in CRIT I

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.9735b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, June 1, 1991, p. 9735-9743. Research supported by Swedish National Sp

Physics

16

Alternating Current, Artificial Clouds, Barium, Earth Ionosphere, Plasma-Electromagnetic Interaction, Circular Cylinders, Field Aligned Currents, Gyrofrequency, Ion Cyclotron Radiation

Scientific paper

The motion of a low-beta circularly cylindrical cloud of plasma which starts with uniform velocity across the magnetic field through a larger ambient plasma is modeled. The cloud axis is aligned with the magnetic field. The density limit above which the cloud is self-polarized is determined. At lower densities the internal electric field is tilted at an angle between antiparallel to the injection direction Vi and the self-polarization direction and becomes close to antiparallel to Vi for thin clouds. The ions in thin clouds perform a collective gyration with decreasing amplitude. The currents perpendicular to B inside the cloud are a combination of electron Hall current, ion current, and plasma displacement current. They combine as magnetic-field-aligned currents which are drawn from the ambient ionosphere by a divergence in the perpendicular electric field. The low-density version of this model is applied to an oscillation observed by a subpayload in the CRIT I experiment.

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