Ion cyclotron instability in the auroral F region

Details Ion cyclotron instability in the auroral F region Ion cyclotron instability in the auroral F region

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.9845l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Nov. 1, 1984, p. 9845-9849.

Physics

15

Auroral Zones, F Region, Ion Cyclotron Radiation, Magnetohydrodynamic Stability, Space Plasmas, Dispersion, Plasma Diffusion, Velocity Distribution

Scientific paper

An ion-cyclotron instability, propagating nearly transverse to the ambient magnetic field and having frequencies near the harmonics of the ion-cyclotron frequency, can be excited by the distorted ion-velocity distribution functions present in the F region of the high-latitude ionosphere. The instability occurs for D greater than 1.256 (D being the ratio of the E x B(0) drift speed to the ion thermal speed, corresponding to the temperature of the neutral species), and its growth rate increases by the increase of D. The instability can generate irregularities with wavelengths ranging from 3 m to 15 m. At an altitude of about 250 km, the instability-induced diffusion dominates over the ion-neutral collisions for wave-electric-field amplitude levels of about 5 percent of the ambient electric-field value. At higher altitudes the diffusion effects are expected to become even more important.

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