Laboratory modeling of physical processes in the ionosphere modified by powerful radio emission |
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Authors: | A V Kostrov V V Nazarov M V Starodubtsev |
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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 present the results of the laboratory modeling of physical processes occurring in the ionosphere during active experiments
on the ionospheric modificaton by powerful radio emission. The process of nonuniform thermo-diffusion of a magnetoplasma due
to local electron heating is studied under the conditions modeling the ionospheric F layer. It is revealed by direct measurements
that thermo-diffusion and diffusion are accompanied by excitation of macroscopic eddy currents. In this case, electrons and
ions diffuse along and across the magnetic field, respectively, and the eddy current is carried by particles of the background
plasma. As a result, a magnetic-field-aligned density depletion rapidly forms in the plasma. The possibility of trapping and
guided propagation of Langmuir waves in such a plasma inhomogeneity is demonstrated. Conditions are found under which the
wave trapping and the formation of the inhomogeneity occur in a self-consistent regime, i.e., Langmuir waves are trapped in
a small-scale inhomogeneity which, in turn, is formed due to local plasma heating by the field of the trapped waves. Such
nonlinear wave trapping takes place only above a certain threshold, which significantly increases in the vicinity of gyroharmonics.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 50, No. 8, pp. 731–746, August 2007. |
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