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Ann. Geophys., 24, 467-474, 2006
www.ann-geophys.net/24/467/2006/
© European Geosciences Union 2006
Dust grain dynamics due to nonuniform and nonstationary high-frequency radiations in cold magnetoplasmas
A. K. Nekrasov and F. Z. Feygin
Institute of Physics of the Earth, Russian Academy of Sciences, 123995 Moscow, Russia
Abstract. A general nonlinear theory for low-frequency
electromagnetic field generation due to high-frequency nonuniform and
nonstationary electromagnetic radiations in cold, uniform, multicomponent,
dusty magnetoplasmas is developed. This theory permits us to consider the
nonlinear action of all waves that can exist in such plasmas. The equations
are derived for the dust grain velocities in the low-frequency nonlinear
electric fields arising due to the presence of electromagnetic cyclotron
waves travelling along the background magnetic field. The dust grains are
considered to be magnetized as well as unmagnetized. Different regimes for
the dust particle dynamics, depending on the spatio-temporal change of the
wave amplitudes and plasma parameters, are discussed. It is shown that
induced nonlinear electric fields can have both an electrostatic and
electromagnetic nature. Conditions for maximum dust acceleration are found.
The results obtained may be useful for understanding the possible mechanisms
of dust grain dynamics in astrophysical, cosmic and laboratory plasmas under
the action of nonuniform and nonstationary electromagnetic waves.
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