The Platteville high power facility

Carroll, J. C.; Violette, E. J.; Utlaut, W. F.

doi:10.1029/rs009i011p00889

Cited by 27 publications

(12 citation statements)

References 4 publications

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“…Since the first observations of AFAS, the phenomenon has been investigated extensively by the author and others in hopes of obtaining insights into the physics of ionospheric heating, improved knowledge of the dynamics and physics of the normal ionosphere, and a potentially useful new method for establishing long-distance communication circuits. The experimental observations described in this paper were all made using the Platteville heater [Carroll et al, 1974]. Observations were carried out during six observation periods, averaging about a fortnight in length between October 1970 and Octo-ber 1973.…”

Section: Introductionmentioning

confidence: 99%

Field‐aligned scattering from a heated region of the ionosphere—Observations at HF and VHF

Fialer¹

1974

Radio Science

172

106

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Radio scattering measurements have been made of a region of the ionosphere above the Institute for Telecommunication Sciences' ionospheric heating facility at Platteville, Colorado. Strong scattering was observed at frequencies in the HF and VHF bands. The scattering has been shown to originate from electron density fluctuations that are highly elongated in the direction of the geomagnetic field. Radar scattering cross sections of 70 to 80 dbsm are measured in the HF and low VHF bands. The scattering cross section decreases at a rate of 20 to 30 db per octave at the high end of the VHF band. The scattering irregularities are produced by operation of the heating facility with o‐mode polarization at frequencies that reflect within the ionosphere. The strength of the scattered energy decreases at a rate of at least 10 db per degree for observation geometries that do not match the geometry for specular reflections from long cylinders aligned with the geomagnetic field. The spatial distribution of irregularities has been estimated for both E‐ and F‐region heating. The temporal properties of the scattering have also been determined including the frequency spectrum of the scattered signals. The processes by which ionospheric heating produces these irregularities are not yet fully explained. Several potentially useful applications of radio scattering from such irregularities are discussed.

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Section: Introductionmentioning

confidence: 99%

Field‐aligned scattering from a heated region of the ionosphere—Observations at HF and VHF

Fialer¹

1974

Radio Science

172

106

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“…The Platteville, high-power, HF Facility used as part of this investigation is essentially the same as that described by Carroll et al [1974]. The facility is equipped with a transmitter consisting of ten identical amplifier channels that are tuneable in the frequency range from 2.7-25 MHz.…”

Section: Hf Facilitymentioning

confidence: 99%

Performance of VLF, LF, and MF telecommunication systems in a simulated satellite power system environment ascertained by experimental means

Rush¹,

Violette²,

Espeland³

et al. 1981

Radio Science

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The purpose of this paper is to describe the results of experiments undertaken to assess the potential impact of the operation of the Satellite Power System on the D and E regions of the ionosphere, and on telecommunication systems that are dependent upon the structure of the lower ionosphere. Using the high‐power, high‐frequency transmitter facility located at Platteville, Colorado, power densities equivalent to the Satellite Power System can be delivered to heights of 70 to 100 km above the surface of the earth. Observations of the performance of telecommunication systems that operate in the VLF, LF, and MF portions of the spectrum have been investigated during times when the ionosphere was modified with power densities comparable to the Satellite Power System and when it was not. The results obtained indicate that the Satellite Power System as currently designed with a peak power density of 23 mW/cm2 is not likely to impact in an adverse manner upon the performance of VLF, LF, and MF telecommunication systems.

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“…The first ground-based artificial ionosphere heating experiment was led by Utlaut, in April 1970 in Platteville, USA [4,5]. However, the theory of groundbased artificial ionospheric modification had been developed in the 1950s.…”

Section: Introductionmentioning

confidence: 98%

Characteristics of high frequency radio wave propagated in heated ionospheric regions

Zhao

2009

Front. Electr. Electron. Eng. China

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A two-dimensional Ohm heating theoretic model in the magnetizing ionosphere and a ray-tracing model in a discrete ionosphere background are used to analyze quantitatively the characteristics (mainly the Doppler shift and the phase shift) of the over-the-horizon radar (OTHR) wave, which propagates through the ionospheric region heated by high frequency radio wave. The simulation results about the Doppler and the phase shift are obtained within two minutes after the heater is on. Preliminary conclusions are given by comparing the numerical results with experimental data.

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The Platteville high power facility

Cited by 27 publications

References 4 publications

Field‐aligned scattering from a heated region of the ionosphere—Observations at HF and VHF

Field‐aligned scattering from a heated region of the ionosphere—Observations at HF and VHF

Performance of VLF, LF, and MF telecommunication systems in a simulated satellite power system environment ascertained by experimental means

Characteristics of high frequency radio wave propagated in heated ionospheric regions

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