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- Title
An assessment of how a combination of shears, field-aligned currents and collisions affect $F$-region ionospheric instabilities.
- Authors
J.-P. ST.-MAURICE; J.-M. NOËL; P. J. PERRON
- Abstract
We present an in depth study of the fluid limit of a kinetically derived collisional, current-driven instability that includes shears in the field-aligned currents as well as collisions. We show how the theory presented here generalizes other theories, including the collisionless current-driven electrostatic ion acoustic instability and its sheared collisionless version. We offer a low-frequency generalization of the zero frequency ion shear driven instability by minimizing the relative drift magnitude as well as the shears themselves. We discuss the implication of our theoretical framework both for strongly field-aligned modes and modes where the wavevectors have arbitrary angles with respect to the ambient magnetic field. We discuss the results in terms of $F$-region irregularity observations of coherent echoes by ionospheric radars.
- Subjects
FLUIDS; COLLISIONS (Nuclear physics); ELECTROSTATICS; MAGNETIC fields; RADAR
- Publication
Journal of Plasma Physics, 2007, Vol 73, Issue 1, p69
- ISSN
0022-3778
- Publication type
Article
- DOI
10.1017/S002237780600434X