Prompt striations in ionospheric barium clouds due to a velocity space instability

Details Prompt striations in ionospheric barium clouds due to a velocity space instability Prompt striations in ionospheric barium clouds due to a velocity space instability

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85..671s&link_type=abstract

Journal of Geophysical Research, vol. 85, Feb. 1, 1980, p. 671-677.

Physics

5

Barium Ion Clouds, Earth Ionosphere, Magnetohydrodynamic Stability, Velocity Distribution, Cyclotron Frequency, Ion Injection, Linearity, Mathematical Models, Striation, Vlasov Equations

Scientific paper

The linear theory of electrostatic instabilities of the drift loss-cone type has been developed for a velocity distribution appropriate to the shaped-charge barium injection experiment Buaro. The dispersion relation for the instability in a Vlasov plasma has been solved numerically. The results show a low-frequency instability that we interpret as the source of prompt striations observed in Buaro and cyclotron instabilities that appear to correspond to observed ion cyclotron fluctuations. These instabilities have much faster growth rates than drift instabilities of fluid theories and therefore provide a better description of the observations.

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