Nonlinear evolution of high-latitude ionospheric interchange instabilities with scale-size-dependent magnetospheric coupling

Journal Article · Sat Sep 01 04:00:00 EDT 1990 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/JA095iA09p15157· OSTI ID:5312448

Keskinen, M J; Huba, J D ^[1]

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1. Naval Research Lab., Washington, DC (USA)

The Naval Research Laboratory high-latitude ionosphere-magnetosphere mesoscale coupling model has been generalized to include scale-size-dependent magnetospheric coupling. With this model, the nonlinear evolution of plasma interchangelike instabilities and processes in the high-latitude ionosphere has been studied using computer simulation techniques. The authors find that the principal effect in the high-latitude ionosphere of magnetospheric coupling, i.e., increased inertial effects, is most pronounced for long-wavelength interchange-driven ionospheric fluctuations of several tens of kilometers and greater. For scale sizes of a few kilometers to tens of kilometers the phenomenology and time scales of the nonlinear evolution of ionospheric interchange modes can be characterized as neither purely inertial (magnetospheric control) nore purely collisional (ionospheric control). For scale sizes less than a few kilometers the nonlinear interchange evolution can be described as a purely collisional process. Density and electric field fluctuation power spectra have been computed from the simulations and found to be in agreement with experimental observations. With scale-size-dependent magnetospheric coupling, spectral breaks at scale sizes of the order of a few kilometers are observed in the density and electric field spectra. Applications to mesoscale dynamics, structure, and the stability of convecting inhomogeneities and large-scale plasma density structures in the high-latitude ionosphere have been made.

• OSTI ID: 5312448
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 95:A9; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

640201* -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COMPUTERIZED SIMULATION
DRIFT INSTABILITY
DYNAMICS
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
ELECTRIC FIELDS
INSTABILITY
INTERACTIONS
IONOSPHERE
MATHEMATICAL MODELS
MECHANICS
MESOSPHERE
NONLINEAR PROBLEMS
PLANETARY IONOSPHERES
PLASMA DENSITY
PLASMA DRIFT
PLASMA INSTABILITY
PLASMA MICROINSTABILITIES
SIMULATION