Ion-acoustic enhancements generated by beam-plasma instability in an auroral cavity

Citation:
Ion-acoustic enhancements generated by beam-plasma instability in an auroral cavity, Ziebell, L. F., Yoon P. H., Pavan J., and Gaelzer R. , Journal of Geophysical Research, March, Volume 116, Number A3, p.A03320, (2011)

Abstract:

This article demonstrates the generation of enhanced ion-acoustic waves by beam-plasma instability in a density cavity. The self-consistent equations of weak turbulence theory that include quasi-linear, decay, and scattering processes as well as convective and dispersive effects are numerically solved for a one-dimensional density cavity. It is shown that significant enhancements of ion-acoustic waves occur in the presence of counterstreaming electron beams and that the enhanced ion-acoustic waves are initially localized near the center of the density cavity at large wavelengths. Later in the evolution, the enhancement in the spectrum of ion-acoustic waves spreads out toward the edges of the cavity, with a shift to smaller wavelengths, while the enhancement near the center of the cavity tends to decrease in magnitude. The significance of the present findings is discussed.

Notes:

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