A reliable ionosonde for continuous automatic operation

Morgan, M. Granger; Pratt, B.

doi:10.1029/rs010i010p00859

Cited by 5 publications

(2 citation statements)

References 9 publications

(8 reference statements)

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“…We have come to refer to these as "slitscanner" records. Our ionosondes [Morgan and Pratt, 1975] make an ionogram every 2 min, and obtain one week of continuous recording on a 125-ft roll of 16-mm film. A suitable time scale for the slitscanner records is 13.25 cm/24 hr so that each week's roll of ionograms is converted to a 3-ft film strip.…”

Section: Introductionmentioning

confidence: 99%

Locating TID sources with a north‐south chain of rapid‐run ionosondes in western Québec

Morgan¹

1983

Radio Science

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Three rapid‐run ionosondes placed mutually 150 km apart for determination of the vector motion of traveling ionospheric disturbances, near L = 3.3 in northern New Hampshire and Vermont, were augmented with three more ionosondes laid out northward near L = 4.0. 4.5, and 6.0 in western Québec along the predominant direction (north‐northwest) from which daytime TID's arrive at the New Hampshire‐Vermont network. Observations were made for the 3‐month period March, April, May 1982. In a preliminary analysis, records have been reduced by our “slit‐scanner” technique to produce continuous displays of virtual height at selected frequencies moderately below the F layer critical. These isofrequency waveforms show a high degree of correlation among the three network stations, with propagation time delays from which speed and direction of TID travel can be deduced. An example, from 1980 observations, is shown of remarkable correlation over many daytime hours of the waveforms obtained by the network stations with that obtained by a sounder placed 1500 km downstream in the predominant direction (south‐southeast) toward which the TID's go. On the other hand, sources have now been found to be located as little as 200 km upstream from the network. TID's and their causative gravity waves propagate northward from these sources as well as southward. The sources are evidently narrow in north‐south extent for they frequently exist between the stations, spaced some 275 km apart, without causing absorption of ionosonde signals at either adjacent station. However, when they are located at an ionosonde station, they cause complete loss of echoes, thereby confirming that they are zones of energetic particle precipitation. They are believed to be due to precipitation from the outer radiation belt.

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Section: Introductionmentioning

confidence: 99%

Locating TID sources with a north‐south chain of rapid‐run ionosondes in western Québec

Morgan¹

1983

Radio Science

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“…Several other research groups have also developed their own versions of AIS systems in the last two decades, as described by Kasuya and Koseki (1969), Clarke (1971), Morgan and Pratt (1975), Poole (1985), Po oie and Evans (1985), and Bowman et al (1986). Several other research groups have also developed their own versions of AIS systems in the last two decades, as described by Kasuya and Koseki (1969), Clarke (1971), Morgan and Pratt (1975), Poole (1985), Po oie and Evans (1985), and Bowman et al (1986).…”

Section: Seleeted Speeifieationsmentioning

confidence: 99%

Radio Techniques for Probing the Terrestrial Ionosphere

Hunsucker¹

1991

Physics and Chemistry in Space

105

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The frequency‐agile radar: A multifunctional approach to remote sensing of the ionosphere

Tsunoda¹,

Livingston²,

Buonocore³

et al. 1995

Radio Science

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We introduce a new kind of diagnostic sensor that combines multifunctional measurement capabilities for ionospheric research. Multifunctionality is realized through agility in frequency selection over an extended band (1.5 to 50 MHz), system modularity, complete system control by software written in C, and a user‐friendly computer interface. This sensor, which we call the frequency‐agile radar (FAR), incorporates dual radar channels and an arbitrary waveform synthesizer that allows creative design of sophisticated waveforms as a means of increasing its sensitivity to weak signals while minimizing loss in radar resolution. The sensitivity of the FAR is determined by two sets of power amplifier modules: four 4‐kW solid‐state broadband amplifiers, and four 30‐kW vacuum tube amplifiers. FAR control is by an AT‐bus personal computer with on‐line processing by a programmable array processor. The FAR does not simply house the separate functions of most radio sensors in use today, it provides convenient and flexible access to those functions as elements to be used in any combination. Some of the first new results obtained with the FAR during recent field campaigns are presented to illustrate its versatility. These include (1) the first detection of anomalous high‐frequency (HF) reflections from a barium ion cloud, (2) the first evidence of unexpectedly large drifts and a shear north of the equatorial electrojet, (3) the first HF radar signature of a developing equatorial plasma bubble, and (4) the first measurements by a portable radar of altitude‐extended, quasi‐periodic backscatter from midlatitude sporadic E. We also mention the potential of the FAR for atmospheric remote sensing.

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A reliable ionosonde for continuous automatic operation

Cited by 5 publications

References 9 publications

Locating TID sources with a north‐south chain of rapid‐run ionosondes in western Québec

Locating TID sources with a north‐south chain of rapid‐run ionosondes in western Québec

Radio Techniques for Probing the Terrestrial Ionosphere

The frequency‐agile radar: A multifunctional approach to remote sensing of the ionosphere

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