Stabilization of electrostatic, purely growing, finite ion gyroradius, flute instabilities in the ionosphere

Details Stabilization of electrostatic, purely growing, finite ion gyroradius, flute instabilities in the ionosphere Stabilization of electrostatic, purely growing, finite ion gyroradius, flute instabilities in the ionosphere

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.7513s&link_type=abstract

Journal of Geophysical Research, vol. 86, Sept. 1, 1981, p. 7513-7518. Research supported by the U.S. Defense Nuclear Agency.

Other

9

Barium Ion Clouds, Electrostatic Waves, Ionospheric Composition, Ionospheric Ion Density, Larmor Radius, Magnetohydrodynamic Stability, Ion Motion, Plasma Composition, Plasma Density, Plasma Dynamics, Striation, Thermal Plasmas, Wave Dispersion

Scientific paper

It has recently been suggested that electrostatic, purely growing, finite ion gyroradius flute instabilities induced by an ion loss cone distribution function are responsible for the prompt striations observed in the Buaro barium release. It is shown in the present paper that these finite ion gyroradius instabilities are not a general feature of ionospheric plasma expansion across a magnetic field, but instead can usually be stabilized by the background plasma. A dispersion relation is derived for the case of a two-component infinite homogeneous plasma model consisting of a thermal plasma background and a high-velocity ion component with associated electrons which arises from a shaped barioum release or other natural or artificial phenomenon, and evaluated qualitatively and quantitatively. Minimum ambient plasma densities required to stabilize various types of instability are presented, and it is found that the background plasma, although not dense enough to stabilize the Buaro shaped barium release, acts to reduce its linear growth rate from the level predicted by a model not including ambient plasma dynamics.

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