Electromagnetic effects in the analysis of prompt striations

Details Electromagnetic effects in the analysis of prompt striations Electromagnetic effects in the analysis of prompt striations

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....8611451s&link_type=abstract

Journal of Geophysical Research, vol. 86, Dec. 1, 1981, p. 11451-11457. Research supported by the U.S. Defense Nuclear Agency.

Physics

2

Barium Ion Clouds, Electromagnetic Interactions, Ionospheric Disturbances, Ionospheric Ion Density, Space Plasmas, Striation, Atmospheric Models, Geomagnetism, Ion Cyclotron Radiation, Magnetic Field Configurations, Magnetospheric Ion Density, Plasma Density

Scientific paper

Field-aligned structures, called prompt striations, have been found to develop on the ion-cyclotron time scale in ionospheric barium injection experiments and have been attributed to plasma jetting across the ambient magnetic field. Although the electrostatic analysis of these structures is justified in the case of experiments in which the directed ion kinetic energy per unit volume is much smaller than the magnetic field pressure, it is not appropriate for higher altitude experiments in which the ambient magnetic field strength is weaker, so that the full electromagnetic dispersion relation must be examined. It is shown that electromagnetic effects inhibit the growth of the linear instability which has been considered to be the source of prompt striations in earlier experiments, by a theory which suggests that the striations can develop from ion jets in the magnetosphere only if the plasma density is tenuous enough for electromagnetic stabilization to be incomplete.

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