The collective gyration of a heavy ion cloud in a magnetized plasma

Details The collective gyration of a heavy ion cloud in a magnetized plasma The collective gyration of a heavy ion cloud in a magnetized plasma

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992adspr..12r..91b&link_type=abstract

(Active experiments in space; Proceedings of the Topical Meeting of the Interdisciplinary Scientific Commission D /Meeting D3/ o

Computer Science

2

Barium Ion Clouds, Gyrofrequency, Heavy Ions, Space Charge, Space Plasmas, Earth Ionosphere, Field Aligned Currents, Ion Injection, Magnetohydrodynamic Waves

Scientific paper

Results are reported from the ionospheric barium injection experiments CRIT I and CRIT II, during both of which a long-duration oscillation was observed with a frequency close to the gyrofrequency of barium and a time duration of about 1 sec. A model for the phenomenon which was proposed for CRIT I is compared to the results from CRIT II, which made a much more complete set of measurements. The model follows the motion of a low-beta ion cloud through a larger ambient plasma. As the ions move across the magnetic field, the space charge is continuously neutralized by magnetic-field aligned electron currents from the ambient ionosphere, drawn by the divergence in the perpendicular electric field. These currents yield a perturbation of the magnetic field related to the electric perturbation by Delta-E/Delta-B is approximately equal to V sub A. The possibility of extending the model to the active region, where the ions are produced in this type of self-ionizing injection experiments, is discussed.

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