The impedance of a dipole antenna in the ionosphere: 2. Comparison with theory

Meyer, P.; Vernet, N.

doi:10.1029/rs010i005p00529

Cited by 23 publications

(9 citation statements)

References 14 publications

(6 reference statements)

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“…In laboratory experiments on dipole impedance, Jassby and Bachynski [1969] measured resistances which they could not account for theoretically for to < top. A similar discrepancy between an experiment in the ionosphere and theory has been reported by Meyer and Vernet [1975]. In both these cases, the theory is essentially that of Kuehl [1966Kuehl [ , 1967.…”

Section: Comparison With Experimental Datasupporting

confidence: 72%

“…The frequency variations of the resistance shown by the curves in Figure 11 are similar to those shown by the experimental curves in Figure 13, which is the same as Figure 6 of Meyer and Vernet [1975]. This similarity increases if the curves in Figure 11 are redrawn by fixing to and by changing %, and hence the normalized length (l/ha) and radius (a / ha) of a dipole.…”

Section: Comparison With Experimental Datasupporting

confidence: 67%

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A boundary‐value problem treatment of an electric dipole in a warm isotropic plasma using the multiple water bag model

Singh¹

1978

Radio Science

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A boundary‐value problem for a dipole immersed in a warm isotropic plasma has been solved using the multiple water bag (MWB) and fluid models of the plasma. The MWB model contains information on the electron distribution function, and hence gives results in agreement with the kinetic theory of the warm plasma. Comparing results from the MWB model with those from the fluid model, we find that the latter are correct only when the antenna frequency ω is sufficiently above the plasma frequency ωp. The current distribution and the driving‐point impedance are calculated for dipoles of several lengths. We find that the current distribution is triangular only when ω is well above ωp or when ω < ωl where ωl, is the frequency at which a resonance occurs in the driving point admittance; ωl is less than ωp and decreases with the increasing length of the dipole. The current distribution for frequencies close to ωp is oscillatory, with a complex wavenumber which is close to the wavenumber of the third‐order Landau mode. Only for very short dipoles with lengths less than 10 Debye lengths or so can the current distribution be approximated by a triangular one for all frequencies. The calculated frequency variation of the dipole resistance with frequency based on the MWB model is similar to those measured experimentally; for frequencies just below ωp the theory in this paper predicts a much larger resistance for the dipole than previous theories.

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Section: Comparison With Experimental Datasupporting

confidence: 72%

Section: Comparison With Experimental Datasupporting

confidence: 67%

A boundary‐value problem treatment of an electric dipole in a warm isotropic plasma using the multiple water bag model

Singh¹

1978

Radio Science

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“…[28] Just above the plasma frequency the antenna resistance exhibits a clear resonance which becomes sharper as l D decreases, as was expected theoretically and has been observed in space experiments, both by active measurements of impedance and by passive measurements of the spectrum of natural thermal noise [e.g., Meyer and Vernet, 1975;Maksimovic et al, 1995].…”

Section: Self-impedancesmentioning

confidence: 55%

Modeling of Cluster's electric antennas in space: Application to plasma diagnostics

et al. 2005

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[1] The main characteristics of the long-boom electric antennas installed on board the Cluster satellites are derived from finite element modeling in a kinetic and isotropic space plasma, in the frequency range of about 1-100 kHz. The model is based on the surface charge distribution method in quasi-static conditions. The impedances of both types of antenna, i.e., the double-wire and the double-probe, are computed versus the frequency normalized with respect to the local plasma frequency and for several different Debye lengths. Most of the code outputs are checked using analytic estimations for better understanding of the involved physical mechanisms. As a by-product, the effective length of the double-probe antenna and the mutual impedance between the two antennas are computed by the code. It is shown that if it had been possible to implement such measurements on board, one would have been able not only to determine accurately the electric characteristics of the antennas but also to estimate the local plasma parameters. Nevertheless, an interesting feature predicted by the model has been checked recently in orbit by running a special mode of operation for testing the mutual impedance measurement. The preliminary results are globally consistent with the predictions, except that they suggest that our Maxwellian model for the electron distribution should be revised in order to explain the unexpected low-frequency response. After analysis of the electron flux measurements obtained simultaneously, it appears that a rough adjustment of the electron distribution with a two-component distribution allows us to account for the observations. Citation: Béghin, C., P. M. E. Décréau, J. Pickett, D. Sundkvist, and B. Lefebvre (2005), Modeling of Cluster's electric antennas in space: Application to plasma diagnostics, Radio Sci., 40, RS6008,

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“…Scott and Rao [1969] have observed this phenomenon while using a monopole antenna in an isotropic laboratory plasma in which the neutral gas pressure has been low. Meyer and Vernet [ 1975] have pointed out that the theoretical input resistance of a short dipole, for [ < [p, has been too low by a factor of 100 to explain the experimental results in the ionosphere. In their papers they proposed some hypotheses which have not yet been verified experimentally.…”

Section: Theoretical Investigationmentioning

confidence: 62%

Measurement of the impedance of a linear antenna in a magnetoplasma

Sawaya¹,

Ishizone²,

Mushiake³

1978

Radio Science

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Impedance of a monopole antenna oriented at various directions with respect to the static magnetic field has been measured in an RF‐generated magnetoplasma. The antenna length is comparable to a free space wavelength. To interpret the experimental results, theoretical values of the input impedance have been calculated by using the EMF method with a uniaxial approximation for the magnetoplasma and some other assumptions. The agreement between theoretical values and measured data has been fairly good except that the effective collision frequency has been much higher than that expected from the collision cross section. Some interesting resonance phenomena of the antenna impedance, depending on the antenna length and the slant angle with respect to the static magnetic field, have been observed.

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The impedance of a dipole antenna in the ionosphere: 2. Comparison with theory

Cited by 23 publications

References 14 publications

A boundary‐value problem treatment of an electric dipole in a warm isotropic plasma using the multiple water bag model

A boundary‐value problem treatment of an electric dipole in a warm isotropic plasma using the multiple water bag model

Modeling of Cluster's electric antennas in space: Application to plasma diagnostics

Measurement of the impedance of a linear antenna in a magnetoplasma

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