Growing ion holes as the cause of auroral double layers

Details Growing ion holes as the cause of auroral double layers Growing ion holes as the cause of auroral double layers

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..164t&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, Feb. 1988, p. 164-167. DOE-supported research.

Physics

25

Auroral Zones, Ion Acoustic Waves, Magnetohydrodynamic Stability, Plasma Layers, Ion Distribution, Particle Acceleration, Satellite Observation

Scientific paper

The nonlinear ion-hole instability is proposed as the cause of intermittent double layers observed in the auroral particle-acceleration region. A novel feature of the instability is its occurrence in plasma that is stable to linear ion-acoustic waves. A growing ion-hole has a double layer potential structure. It is demonstrated here that the nonlinear hole instability is consistent with S3-3 and Viking satellite data. Instability thresholds, as well as characteristic double-layer amplitudes, potential drops, speeds, and scale sizes are calculated. The inadequacy of conventional linear instability models in explaining the data is discussed.

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