In mathematics, the Zakharov system is a system of non-linear partial differential equations, introduced by Vladimir Zakharov in 1972 to describe the propagation of Langmuir waves in an ionized plasma. The system consists of a complex field u and a real field n satisfying the equations

${\displaystyle {\begin{aligned}i\partial _{t}^{}u+\nabla ^{2}u&=un\\\Box n&=-\nabla ^{2}(|u|_{}^{2})\end{aligned}}}$

where ${\displaystyle \Box }$ is the d'Alembert operator.

• Resonant interaction; the Zakharov equation describes non-linear resonant interactions.

• Zakharov, V. E. (1968). Stability of periodic waves of finite amplitude on the surface of a deep fluid. Journal of Applied Mechanics and Technical Physics, 9(2), 190-194.
• Zakharov, V. E. (1972), "Collapse of Langmuir waves", Soviet Journal of Experimental and Theoretical Physics, 35: 908–914, Bibcode:1972JETP...35..908Z.

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