An explanation of the ion cloud morphology in the CRRES plasma injection experiments

Details An explanation of the ion cloud morphology in the CRRES plasma injection experiments An explanation of the ion cloud morphology in the CRRES plasma injection experiments

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10621289d&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A10, p. 21289-21296

Physics

3

Ionosphere: Active Experiments, Ionosphere: Electric Fields, Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Plasma Waves And Instabilities

Scientific paper

Optical observations of the CRRES plasma injection experiments revealed a highly structured ion cloud. In an attempt to understand these structures, we have developed a three-dimensional hybrid code to study the interaction between an injected plasma cloud and an ambient magnetized plasma. The primary advantage of this code is a seamless interface between a small plasma cloud, treated with fully kinetic particles, and an MHD fluid (ambient plasma). The results of the simulation are in good agreement with the observations. According to the simulation, a very dense ion core was formed as the neutral barium photoionized. The core polarized and moved in the initial injection direction via E×B drift. The simulation also provided insight into a structured secondary neutral cloud created by Ba-Ba+ charge exchange. Specifically, the ion core split into two parts along the magnetic field, creating a nonuniform distribution of charge-exchanged neutrals. This structured ion core also leads to a herringbone structure in the trailing ion cloud. The code can be applied to similar problems including comets, coronal mass ejections, the Io-Jupiter interaction, and other plasma injection experiments.

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