Observations of cloud‐produced amplitude scintillation on 19‐ and 28‐GHz earth‐space paths

Cox, D.C.; Arnold, H. W.; Hoffman, H.

doi:10.1029/rs016i005p00885

Cited by 41 publications

(13 citation statements)

References 11 publications

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“…Such circumstances are typically accompanied by the production of heavy cumulus cloud and precipitation. The association of heavy cumulus cloud and scintillation has been observed [8].…”

Section: Introductionmentioning

confidence: 98%

Evidence for the presence of turbulent attenuation on low-elevation angle Earth-space paths. I. Comparison of CCIR recommendation and scintillation observations on a 3.3° path

Yusoff

Sengupta

Alder

et al. 1997

IEEE Trans. Antennas Propagat.

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This paper presents the results of and conclusions drawn from two experimental studies of low-elevation slant-path scintillation. Part I describes observations made on an 11.2 GHz, 3.3 path over a two and a half year period. Received signal strength and a variety of concurrent meteorological parameters were recorded. The resulting database has enabled the veracity of the 1990 International Telecommunications Union-Radio [(ITU-R)-formerly International Consultative Radio Committee (CCIR)] model to be determined. An interesting discrepancy between the CCIR prediction procedure and the experimental data suggests an as yet unmodeled scintillation mechanism operating in wet summer weather.

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“…Such circumstances are typically accompanied by the production of heavy cumulus cloud and precipitation. The association of heavy cumulus cloud and scintillation has been observed [8].…”

Section: Introductionmentioning

confidence: 98%

Evidence for the presence of turbulent attenuation on low-elevation angle Earth-space paths. I. Comparison of CCIR recommendation and scintillation observations on a 3.3° path

Yusoff

Sengupta

Alder

et al. 1997

IEEE Trans. Antennas Propagat.

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“…This should be more clearly seen in Fig. 5, where the frequency exponent as it would result from all the measurements by applying (9), has been plotted versus the elevation angles of the sites. In this picture, some of the results seem to point in that direction, but the results from Fort Collins, Norman, and Tampa clearly contradict this hypothesis.…”

Section: Comparison With Other Sitesmentioning

confidence: 99%

“…When testing the power law, the frequency dependence of the antenna averaging function should be compensated for. This is done using a "normalized variance ratio" (8) According to the prediction models, this should be equal to (9) with according to ITU-R and according to Karasawa. This normalized variance ratio has been plotted versus the frequency ratio in Fig.…”

Section: Comparison With Other Sitesmentioning

confidence: 99%

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Frequency dependence of amplitude scintillation

Kamp¹,

Riva

Tervonen³

et al. 1999

IEEE Trans. Antennas Propagat.

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Abstract-In the prediction models of tropospheric scintillation on earth-satellite paths from Karasawa, Yamada, and Allnutt and ITU-R, the frequency dependence of scintillation is expressed as a power law with a different exponent for each model. In this paper, this is verified using a collection of measurement results from different satellite links in Europe, the U.S., and Japan at frequencies from 4 to 50 GHz and elevation angles from 2.5 to 52 . It shows that the exponent of the power law varies widely among the results from the different sites. Possible explanations of this are: 1) the frequency dependence of scintillation due to cloudy turbulence is different from that due to clear-sky turbulence and this kind of scintillation may be present to different extents in the various databases due to climatic differences and different clearsky selection procedures or 2) angle-of-arrival fluctuations due to turbulence have a different frequency dependence and this effect may have some impact on the measured scintillation at some of the sites.

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“…The structure constant (C 2 n ) usually becomes large near the Earth's surface and in the clouds [38]. The magnitude of C 2 n generally increases with longer wavelength.…”

Section: Structure Constantmentioning

confidence: 99%

Ducting and Turbulence Effects on Radio-Wave Propagation in an Atmospheric Boundary Layer

Chou¹,

Kiang²

2014

PIER B

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Abstract-The split-step Fourier (SSF) algorithm is applied to simulate the propagation of radio waves in an atmospheric duct. The refractive-index fluctuation in the ducts is assumed to follow a twodimensional Kolmogorov power spectrum, which is derived from its three-dimensional counterpart via the Wiener-Khinchin theorem. The measured profiles of temperature, humidity and wind speed in the Gulf area on April 28, 1996, are used to derive the average refractive index and the scaling parameters in order to estimate the outer scale and the structure constant of turbulence in the atmospheric boundary layer (ABL). Simulation results show significant turbulence effects above sea in daytime, under stable conditions, which are attributed to the presence of atmospheric ducts. Weak turbulence effects are observed over lands in daytime, under unstable conditions, in which the high surface temperature prevents the formation of ducts.

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Observations of cloud‐produced amplitude scintillation on 19‐ and 28‐GHz earth‐space paths

Cited by 41 publications

References 11 publications

Evidence for the presence of turbulent attenuation on low-elevation angle Earth-space paths. I. Comparison of CCIR recommendation and scintillation observations on a 3.3° path

Evidence for the presence of turbulent attenuation on low-elevation angle Earth-space paths. I. Comparison of CCIR recommendation and scintillation observations on a 3.3° path

Frequency dependence of amplitude scintillation

Ducting and Turbulence Effects on Radio-Wave Propagation in an Atmospheric Boundary Layer

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