Pedersen density drift instabilities

Details Pedersen density drift instabilities Pedersen density drift instabilities

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....8810104g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Dec. 1, 1983, p. 10104-10110. Research sponsored by the U.S. Departme

Physics

3

Collisional Plasmas, Density Wave Model, Magnetohydrodynamic Stability, Plasma Drift, Auroral Zones, Ionospheric Electron Density, Kinetic Theory, Magnetic Fields, Particle Collisions, Plasma Density, Space Plasmas, Vlasov Equations

Scientific paper

This paper describes the linear kinetic theory of electrostatic-drift instabilities driven by Pedersen and density-drift velocities. The model uses a uniform magnetic field B; a weak, uniform density gradient in the x direction; and a weak, uniform electric field in the y direction. Weak charged-neutral collisions are represented by the addition of BGK model terms to the Vlasov equation. The resulting local dispersion equation is used to study the properties of the associated instabilities at ka(i) greater than about 1 (where k is the wave number and a(i) is the ion gyroradius). Results show that the E x B gradient drift instability at ka(i) = about 1 may grow in the auroral ionosphere primarily in the vicinity of 200 km and only if the electron density is sufficiently small.

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