Particle simulations of ionospheric injection experiments: Comparison with CRIT II

Details Particle simulations of ionospheric injection experiments: Comparison with CRIT II Particle simulations of ionospheric injection experiments: Comparison with CRIT II

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9819081b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A11, p. 19,081-19,091

Physics

3

Barium Ion Clouds, Earth Ionosphere, Field Aligned Currents, Ion Injection, Ionospheric Conductivity, Mathematical Models, Phase Shift, Spectral Energy Distribution, Chemical Release Modules, Plasma Conductivity

Scientific paper

A one-dimensional particle-in-cell code has been used to study the barium release experiment CRIT II. The electrodynamic response of the ionosphere to these injections has been modeled by magnetic-field-aligned currents, using the concept of Alfven conductivity. After the active phase, when the fast part of the neutral barium cloud passed to the payload, the particle detector 5 AB in the CRIT II experiment, aimed almost perpendicular to the ambient magnetic field B in the direction toward the release, showed two clearly defined types of peaks having different durations, frequencies, and energy distributions. This particle energy spectrum has been reproduced in the numerical simulations. It is shown that geometrical effects and phase shifts of the ions are of secondary importance for the creation of the double-peaked structure. A qualitative model, based on the selective acceleration of barium ions due to electric fields set up by the injection process, is developed to explain the observations.

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