Orientational dependence of certain RF impedance probes in the ionosphere |
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| Authors: | RH Bishop |
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| Institution: | Space Science Laboratory, Utah State University, Logon, Utah, U.S.A. |
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| Abstract: | In an effort to determine electron density and temperature from RF impedance probe measurements, Bishop and Baker (1972) derived an expression using a quasi-static approximation for the impedance of an electrically short cylindrical antenna in a warm magnetoplasma. The problem was limited to the case where the longitudinal axis of the antenna was aligned with the magnetic field. It is the purpose of this paper to remove this restriction on the orientation angle of the antenna by using a perturbation technique valid when either ω or ν is much larger than the electron gyrofrequency. Under these conditions it is found that the antenna impedance has no dependence upon the antenna orientation angle. Although still somewhat restrictive, this result is useful for the whole class of RF probes in which the driving frequency is well above the upper hybrid resonance frequency. |
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