Dissipative instabilities in a mesospheric plasma with the aerosol charging processes taken into account |
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Authors: | V S Grach |
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Institution: | 1.Institute of Applied Physics of the Russian Academy of Sciences,Nizhny Novgorod,Russia |
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Abstract: | We consider dissipative instabilities of a flow of large aerosol particles as a possible mechanism for generation of electric-field
and charged-particle density irregularities in the middle atmosphere. A dispersion equation describing the properties of the
spectral component of a quasistatic electric field with allowance for the aerosol charging inertia and external stationary
electric field is obtained. The equation is used to study characteristics of two possible instabilities, namely, the instability
of a dust-acoustic mode and the instability of an additional low-frequency mode stimulated by the charging inertia. Dependences
of the growth rates of both instabilities on the parameters of the medium and the external stationary electric field are obtained.
Quantitative estimates for the parameters of the aerosol, ion, and electron components and external factors that are necessary
for the excitation of instabilities in the region of the existence of summer polar mesospheric echo, as well as those for
spatial scales of unstable perturbations, are given. |
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Keywords: | |
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