Comparisons of VHF radar, optical, and temperature fluctuation measurements ofC n 2 ,r 0 and? 0

Eaton, Frank D.; Peterson, William A.; Hines, John R.; Peterman, K. Russell; Good, R. E.; Beland, Robert R.; Brown, James H.

doi:10.1007/bf00867654

Cited by 21 publications

(10 citation statements)

References 19 publications

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“…In the visible band, refractivity fluctuations depend only on temperature fluctuations. In the radio range, humidity fluctuations make an additional contribution into refractivity fluctuations, which may be crucial in the lower troposphere (Eaton et al, 1988). Stellar occultations indicated that the atmosphere is characterized by two types of density fluctuations: (1) large-scale anisotropic ones and (2) isotropic ones (Gurvich and Kan, 2003a, b;Sofieva et al, 2007a).…”

Section: -D Models Of Refractivity Fluctuation Spectramentioning

confidence: 99%

Fluctuations of radio occultation signals in sounding the Earth's atmosphere

2018

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Abstract. We discuss the relationships that link the observed fluctuation spectra of the amplitude and phase of signals used for the radio occultation sounding of the Earth's atmosphere, with the spectra of atmospheric inhomogeneities. Our analysis employs the approximation of the phase screen and of weak fluctuations. We make our estimates for the following characteristic inhomogeneity types: (1) the isotropic Kolmogorov turbulence and (2) the anisotropic saturated internal gravity waves. We obtain the expressions for the variances of the amplitude and phase fluctuations of radio occultation signals as well as their estimates for the typical parameters of inhomogeneity models. From the GPS/MET observations, we evaluate the spectra of the amplitude and phase fluctuations in the altitude interval from 4 to 25 km in the middle and polar latitudes. As indicated by theoretical and experimental estimates, the main contribution into the radio signal fluctuations comes from the internal gravity waves. The influence of the Kolmogorov turbulence is negligible. We derive simple relationships that link the parameters of internal gravity waves and the statistical characteristics of the radio signal fluctuations. These results may serve as the basis for the global monitoring of the wave activity in the stratosphere and upper troposphere.

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Section: -D Models Of Refractivity Fluctuation Spectramentioning

confidence: 99%

Fluctuations of radio occultation signals in sounding the Earth's atmosphere

2018

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“…One important class of parameters pertains to the strength of the backscattering, and hence the signal strength. This class involves the choice of wavelength and can be assessed in terms of a simulation using such existing lidar simulation codes as BACKSCAT 3 . The strength of the backscatter signal falls off as density in the case where Rayleigh scattering dominates.…”

Section: Resultsmentioning

confidence: 99%

“…This approach is an adaptation to lidar of the binary-star methods for passive remote sensing' . The method was also suggested 12 as a means of remote sensing across a horizontal distance and a variant has been used to measure turbulence in fluid flow 3 . The strength of the method is that the path weighting is determined by geometric factors.…”

Section: The Crossed Path Techniquementioning

confidence: 99%

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Lidar Measurement of Optical Turbulence: Theory of the Crossed Path Technique

Beland¹,

Krause-Polstorff²

1991

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“…In the optics, refractivity fluctuations depend only on temperature fluctuations. In the radio range, humidity fluctuations make an additional contribution into refractivity fluctuations, which may be crucial in the lower troposphere (Eaton et al, 1988). Stellar occultations indicated that the atmosphere is characterized by two types of density fluctuations: 1) large-scale 20 anisotropic ones and 2) isotropic ones (Gurvich and Kan, 2003a, b;Sofieva et al, 2007a).…”

Section: D Models Of Refractivity Fluctuation Spectramentioning

confidence: 99%

Fluctuations of radio occultation signals in sounding the Earth's atmosphere

Kan¹,

Горбунов²,

Sofieva³

2017

Preprint

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Abstract. We discuss the relationships that link the observed fluctuation spectra of the amplitude and phase of signals used for the radio occultation sounding of the Earth's atmosphere, with the spectra of atmospheric inhomogeneities. Our analysis employs the approximation of the phase screen and of weak fluctuations. We make our estimates for the following characteristic inhomogeneity types: 1) the isotropic Kolmogorov turbulence and 2) the anisotropic saturated internal gravity waves. We obtain the expressions for the variances of the amplitude and phase fluctuations of radio occultation signals, as well as their estimates 5 for the typical parameters of inhomogeneity models. From the GPS/MET observations, we evaluate the spectra of the amplitude and phase fluctuations in the altitude interval from 4 to 25 km in the middle and polar latitudes. As indicated by theoretical and experimental estimates, the main contribution into the radio signal fluctuations comes from the internal gravity waves.The influence of the Kolmogorov turbulence is negligible. We derive simple relationships that link the parameters of internal gravity waves and the statistical characteristics of the radio signal fluctuations. These results may serve as the basis for the 10 global monitoring of the wave activity in the stratosphere and upper troposphere.

show abstract

Comparisons of VHF radar, optical, and temperature fluctuation measurements ofC n 2 ,r 0 and? 0

Cited by 21 publications

References 19 publications

Fluctuations of radio occultation signals in sounding the Earth's atmosphere

Fluctuations of radio occultation signals in sounding the Earth's atmosphere

Lidar Measurement of Optical Turbulence: Theory of the Crossed Path Technique

Fluctuations of radio occultation signals in sounding the Earth's atmosphere

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