Accession Number:

ADA207036

Title:

Three Dimensional Equilibrium and Stability of Ionospheric Plasma Clouds

Descriptive Note:

Memorandum rept.

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Report Date:

1989-03-22

Pagination or Media Count:

67.0

Abstract:

The equilibrium and stability of three dimensional ionospheric plasma clouds is investigated. The equilibrium density profile is assumed to be a 3D waterbag with a circular cross-section transverse to B, and an ellipsoidal cross-section parallel to B. The equilibrium potential consists of two parts a polarization potential driven by a uniform neutral wind, and an ambipolar potential driven by parallel electron pressure. The latter potential is shown to cause sheared azimuthal plasma flows perpendicular to B. A stability analysis of this equilibrium is carried out. It is found that the E X B instability, which causes the structuring of ionospheric plasma clouds, can be stabilized by the azimuthal flow. A marginal stability criterion is derived. On the basis of this stability criteria, striations of barium clouds in the ionospheric F region should be stable to further bifurcation, as is observed. Keywords Barium clouds Ionospheric disturbances E x B instability.

Subject Categories:

  • Atmospheric Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE