Coexistence of parametric decay cascades and caviton collapse at subcritical densities

Journal Article · Mon Apr 15 04:00:00 EDT 1991 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.66.1970· OSTI ID:5716596

DuBois, D F; Rose, H A; Russell, D ^[1]

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1. Los Alamos National Laboratory, MS B262, Los Alamos, New Mexico 87545 (US) Lodestar Research Corporation, 2400 Central Avenue, Boulder, Colorado 80301

We report results of two-dimensional numerical solutions of Zakharov's model for strong Langmuir turbulence excited by powerful electromagnetic pump waves at subcritical densities, as in hf modification of the ionisphere and laser-plasma interactions. The results show that truncated parametric decay cascades can coexist with caviton collapse for moderate pump power. A high level of ion density fluctuations, driven primarly by caviton collapse, produces energy and power spectra which are not consistent with conventional weak turbulence theory.

• OSTI ID: 5716596
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 66:15; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

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GENERAL PHYSICS
CORRELATIONS
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EARTH ATMOSPHERE
ELECTROMAGNETIC RADIATION
FLUCTUATIONS
INFORMATION
INTERACTIONS
ION DENSITY
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PLASMA WAVES
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VARIATIONS
WAVE PROPAGATION