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- W2161652015 abstract "The results of experimental and theoretical investigations of whistler wave emissions from loop radiators immersed in magnetoplasma are discussed, The parameters of our laboratory experiment were chosen such as to model the operation of antennas on board a spaceship in whistler frequency range in space plasma. The experiments were carried out in a large-scale set-up Tonosfera (length 150cm, diameter 80cm) containing a uniform plasma column in a magnetic field directed along the set-up axis. The plasma is produced with high-frequency inductive discharge. A rather large volume of the uniform plasma allows studding the processes without an influence of the set-up walls on the plasma parameters. First, the radiation of loop antennas at low power levels fed to the antenna when no plasma density perturbations were occurred, was studied [I]. At the enhanced power levels (P > 80W) the inhomogeneous structure along the magnetic field may be formed as a result of the nonlinear interaction between the electromagnetic field and surrounding plasma. The waveguide channel can arise due to the electron heating by the quasistatic field of the antenna and the thermal-diffusion redistribution of the plasma connected with it [2]. It is shown that nonuniform distribution of plasma density near the loop causes the variation of the radiation patterns and the value of radiation resistance with respect to a uniform plasma. Then the possibility is shown of controlling the electrodynamics characteristics of VLF loop radiators immersed in a magnetoplasma with the help of feeding the additional intensive impulse at the frequency w > wo where WO is the operation frequency. This impulse creates the intensive near-antenna field whose ponderomotive force moves the plasma away the antenna surface. Simultaneously, this field provides plasma heating along the magnetic field as well as in the case described in [2]. The presence of the ponderomotive force effects appreciably the input antenna impedance at the operation frequency. In particular, this can improve the antenna matching in plasmas. Additionally, the appearance of large-scale strong density perturbations can change the radiation patterns of loop antennas." @default.
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- W2161652015 date "2005-08-29" @default.
- W2161652015 modified "2023-09-25" @default.
- W2161652015 title "Emission of whistler waves from loop radiators in nonuniform magnetoplasmas" @default.
- W2161652015 doi "https://doi.org/10.1109/aem.1996.873085" @default.
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