Spontaneous Emission Effects in Nonlinear Interactions of
Nonresonant Waves with Resonant Plasma Fluctuations
Physics of Plasmas, Vol. 3, No. 2, Pp. 673-681 (1996)
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Abstract
Spontaneous emission effects on propagation of
nonresonant waves in plasmas in the presence of resonant fluctuations
are studied. It is demonstrated that in closed plasma systems
the number of nonresonant quanta is
conserved as an adiabatic invariant. The conservation is
due to the vanishing polarizational
contribution that resulted from the symmetry of the system as well as
due to the balance of the direct nonlinear coupling and reverse absorption
by particle collisions. Energy of the nonresonant waves
as well as their amplitudes may vary with time
even when the resonant field fluctuations are at the thermal level.
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