Results From an RF Capacity Probe Experiment in the Auroral Ionosphere

Holt, O.; Lerfald, G. M.

doi:10.1002/rds19672111283

Cited by 12 publications

(2 citation statements)

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“…Rocketborne r.f. probe measurements have been obtained (Holt and Lerfald 1967) which also show good agreement with those obtained by other means. The quantitative implications of plasma sheath capacitance to laboratory measurements have been explored by Smy and Greig (1 968) who obtained reasonable agreement between the experimentally determined and theoretical time resolution of a Langmuir probe.…”

Section: Introductionsupporting

confidence: 81%

Variation of the r.f. response of a Langmuir probe with amplitude and frequency

Smy

Nation

Simpson

1969

J. Phys. D: Appl. Phys.

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The r.f. response of a double Langmuir probe immersed in a laboratory plasma has been measured over a wide range of signal amplitude, signal frequency and plasma electron density. A theory is developed which predicts (in direct contradiction to the theory of other workers) a decrease in the probe sheath capacitance with increasing frequency in the neighbourhood of the ion plasma frequency, and a probe response above this frequency which at high amplitudes obeys a current is proportional to (voltage)¼ dependence. While no significant change of capacity with frequency is observed, possibly owing to experimental limitations, the high-amplitude results are in good agreement with theory and do show the appropriate current is proportional to (voltage)¼ dependence. This is in contrast to earlier step waveform (i.e. low-frequency) measurements which showed a current is proportional to (voltage)¾ dependence.

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Section: Introductionsupporting

confidence: 81%

Variation of the r.f. response of a Langmuir probe with amplitude and frequency

Smy

Nation

Simpson

1969

J. Phys. D: Appl. Phys.

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“…The altitudes (∼70–95 km) of this region are far too high for balloons and too low for most satellites to reach, making continuous monitoring of the ionospheric D region difficult. To obtain electron density profiles by rockets, various probing techniques [ Holt and Lerfald , 1967; Smith , 1969; Danilov and Vanina , 2001], the exploitation of ionospheric radio wave propagation (differential absorption, Faraday rotation [ Jacobsen and Friedrich , 1979; Friedrich and Torkar , 2001; Mechtly et al , 1967], and the coherent frequency technique [ Seddon , 1953]) have been applied. Although these in situ measurements are precise, the rocket techniques can be used only episodically and at a limited number of locales.…”

Section: Introductionmentioning

confidence: 99%

Nighttime D region electron density profiles and variabilities inferred from broadband measurements using VLF radio emissions from lightning

et al. 2006

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[1] Lightning discharges radiate most of their electromagnetic energy in the very low frequency (VLF, 3-30 kHz) and extremely low frequency (ELF, 3-3000 Hz) bands and are, consequently, an effective tool for remotely sensing the nighttime ionospheric D region electron density profile. Using broadband lightning-generated VLF signals, we derived the night-to-night variations of the midlatitude ionospheric D region electron density profiles. For 16 nights, between 1 July and 4 August 2004, we examined measured VLF data from lightning occurring near the United States east coast ($530-860 km away from Duke University) and received at Duke University from 0400 to 0600 UT. From these observed VLF radio atmospherics (sferics), we extracted the nighttime D region electron density profiles covering the range of electron densities from 10 0 to 10 3 cm À3 , in the altitude range of approximately 70-95 km, using a two-dimensional, laterally homogenous model of VLF propagation in the Earth-ionosphere waveguide. The inferred electron density profile variabilities were in good agreement with those from past nighttime rocket experiments at similar latitudes. Using the rocket-measured profiles in our propagation simulations, we determined that the two-parameter exponential D region electron density profiles we inferred were the best exponential fit, in the electron density range of $3 to $500 cm À3, to the rocket-measured D region electron density profiles. In an initial effort to determine the sources of the observed variabilities, we compared the SAMPEX precipitating electron measurements to the electron density profiles inferred during July 2000. The results indicate that high-energy electron precipitation might account for at least part of the night-to-night variations of the D region electron densities at the midlatitudes.Citation: Cheng, Z., S. A. Cummer, D. N. Baker, and S. G. Kanekal (2006), Nighttime D region electron density profiles and variabilities inferred from broadband measurements using VLF radio emissions from lightning,

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Physics of the Optical Emissions

Omholt¹

1971

Physics and Chemistry in Space

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Results From an RF Capacity Probe Experiment in the Auroral Ionosphere

Cited by 12 publications

References 11 publications

Variation of the r.f. response of a Langmuir probe with amplitude and frequency

Variation of the r.f. response of a Langmuir probe with amplitude and frequency

Nighttime D region electron density profiles and variabilities inferred from broadband measurements using VLF radio emissions from lightning

Physics of the Optical Emissions

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