Anomalous diffusion across the magnetic field-plasma boundary - The Porcupine artificial plasma jet

Details Anomalous diffusion across the magnetic field-plasma boundary - The Porcupine artificial plasma jet Anomalous diffusion across the magnetic field-plasma boundary - The Porcupine artificial plasma jet

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9110183m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Sept. 1, 1986, p. 10183-10187. DFG-supported research.

Physics

18

Anomalies, Magnetic Diffusion, Planetary Magnetic Fields, Plasma Interaction Experiment, Plasma Jets, Collision Rates, Heavy Ions, Ion Beams, Magnetohydrodynamic Stability, Plasma Frequencies

Scientific paper

Very fast magnetic field diffusion into the beam is required for observation of the nearly undisturbed penetration of the Porcupine's dense, fast and heavy ion beam into the magnetized ionospheric plasma after termination of the short adiabatic phase. The diffusion is presently attributed to a transverse electron drift current-driven electrostatic instability that is excited by the diamagnetic current flowing in the boundary layer between the injected beam and the ambient field. The anomalous collision frequencies turn out to be of the order of the local lower hybrid frequency in the dense Xe plasma. Since only a very small fraction of beam energy is dissipated in the diffusion process, no significant deceleration of the ion beam is observable.

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