Physics
Scientific paper
Mar 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11603320z&link_type=abstract
Journal of Geophysical Research, Volume 116, Issue A3, CiteID A03320
Physics
Magnetospheric Physics: Plasma Waves And Instabilities (2471), Magnetospheric Physics: Solar Wind/Magnetosphere Interactions
Scientific paper
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.
Gaelzer R.
Pavan John
Yoon Peter H.
Ziebell L. F.
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