The Resonance Probe - A Tool for Ionospheric and Space Research

Crawford, F. W.; Harp, R. S.

doi:10.21236/ad0608440

Cited by 5 publications

(6 citation statements)

References 5 publications

(7 reference statements)

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“…the probe measurements with the simple theory indicate that no major correction for magnetic field effects is required. Crawford and Harp (1965) have ,made some estimates of magnetic field effects, and it appears that for the electron densities and the De bye lengths we.have observed the required correction is just barely appreciable. Again,,laboratory me.asurements might be of great help, and we hope .to undertake such.…”

Section: Discussionmentioning

confidence: 77%

Results From an RF Capacity Probe Experiment in the Auroral Ionosphere

Holt

Lerfald

1967

Radio Science

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A rocket-borne experiment, in which measurements of the RF capacity of two spherical probes of different size were taken at several frequencies, is described. The experiment was designed to measure electron density, and was performed during an auroral disturbance. Analysis shows the data agree up to 90 km with electron density measurements by a wave-propagation experiment. Above this height the probe data indicate the presence of field-alined enhancements in the ionization. The characteristic "thickness" of these enhancements is ""400 meters. The electron temperature could be estimated from the data, and values in excess of the neutral temperature were indicated.

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Section: Discussionmentioning

confidence: 77%

Results From an RF Capacity Probe Experiment in the Auroral Ionosphere

Holt

Lerfald

1967

Radio Science

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“…Average over a cycle firsfly the quantity found in 2 to obtain the average power dissipated and sheath conductance and secondly the quantity found in 5 to find the average work done in moving charge and the sheath capacitance. There are many papers in the literature [Mlodnosky and Garriott, 1962; Crawford and Mlodno,sky, 1964;Grard, 1965;Harp and Crawford, 1964; Craw-/ord and Harp, 1965;Crawford and Grard, 1966;Driancourt, 1965;Storey, 1965;Grard and Tunaley, 1968;Fiala and Storey, 1970;Aggson and Kapetanakos, 1966;Oliver et al, 1970] dealing with sheaths around antennas at low and high frequencies and with biases applied to the antennas. Most of these theories use linear formulations, valid only if one has both very low peak voltages (of the order --of tens of millivolts) and short conductors (less than 5 m).…”

Section: Integrate the Quantity Found In 4 Along The An-mentioning

confidence: 99%

Nonlinear Sheath Admittance, Currents, and Charges Associated With High Peak Voltage Drive on a VLF/ELF Dipole Antenna Moving in the Ionosphere

Shkarofsky¹

1972

Radio Science

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We consider a bare antenna consisting of two line elements driven by a VLF source and immersed in the ionosphere. Nonlinear effects associated with high voltages up to 1000 volts and with an additional induced v X B. 1 voltage are included. The applied voltage is visualized as a dc effect. For various instantaneous voltage values, we obtain the distribution along the antenna of voltage and resis'lye current, sheath size, and charge per unit length. At the feed points, waveforms for the charge and both resistive and displacement currents are illustrated, assuming an applied cosine voltage form. Averaging over a cycle yields, as a function of peak bias voltage, the average power dissipated in collection of particles from the medium, the average work done in moving charge between the two half-antennas, and the average sheath conductance and capacitance. Numerical results are given for three altitudes and two antenna lengths.

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“…The small-radius probe (r ___ 0.08 cm) gave results of better quality than the larger one (r • 0.8 cm). Thus, it appears that these resonance effects are more pronounced if the probe radius is small compared with the Debye length, which does not confirm the conclusions of Craw/ord and Harp [1965]. Both the standing wave impedance probe and the plasma frequency probe are very useful for ionospheric electron-density measurements.…”

Section: •)Iscussion Of •Esultsmentioning

confidence: 90%

Simultaneous comparison of RF probe techniques for determination of ionospheric electron density

Baker¹,

Despain²,

Ulwick³

1966

J. Geophys. Res.

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Three radio‐frequency (RF) probe techniques—standing wave impedance probe, plasma frequency probe, and resonance rectification probe—have been simultaneously flown on rockets for ionospheric measurements. The results of the three probes are compared to establish the relationships among them. The impedance probe and plasma frequency probe measurements are in general agreement with each other and with other independent measurements. A model of antenna‐ionospheric interaction is used that neglects ion sheath and magnetic field effects. The resonance rectification probe shows resonance effects including peaks and minimums that are a function of probe dc bias. The frequency of the dominant resonance peak does not correspond to the plasma frequency but is near a lower frequency of an impedance series resonance as measured by the plasma frequency probe.

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The Resonance Probe - A Tool for Ionospheric and Space Research

Cited by 5 publications

References 5 publications

Results From an RF Capacity Probe Experiment in the Auroral Ionosphere

Results From an RF Capacity Probe Experiment in the Auroral Ionosphere

Nonlinear Sheath Admittance, Currents, and Charges Associated With High Peak Voltage Drive on a VLF/ELF Dipole Antenna Moving in the Ionosphere

Simultaneous comparison of RF probe techniques for determination of ionospheric electron density

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